The Nagorno-Karabakh conflict is an ethnic and territorial conflict between Armenia and Azerbaijan over the region of Nagorno-Karabakh, inhabited mostly by ethnic Armenians until their expulsion in 2023, and seven surrounding districts, inhabited mostly by Azerbaijanis until their expulsion during the 1990s. The Nagorno-Karabakh region was entirely claimed by and partially controlled by the breakaway Republic of Artsakh, but was recognized internationally as part of Azerbaijan. Azerbaijan gradually re-established control over Nagorno-Karabakh region and the seven surrounding districts. Throughout the Soviet period, Armenians in the Nagorno-Karabakh Autonomous Oblast were heavily discriminated against. The Soviet Azerbaijani authorities suppressed Armenian culture and identity in Nagorno-Karabakh, pressured Armenians to leave the region, and encouraged Azerbaijanis to settle within it, although Armenians remained the majority population. Motivated by fears of cultural and physical erasure under government policies from Azerbaijan, the Karabakh Movement advocated for the reunification ("miatsum") of the enclave with Soviet Armenia. A referendum in 1988 was held to transfer the region to Soviet Armenia, citing self-determination laws in the Soviet constitution. The Karabakh Movement was met with a series of pogroms against Armenians across Azerbaijan, before violence committed against both Armenians and Azerbaijanis occurred. The conflict escalated into a full-scale war in the early 1990s following the dissolution of the Soviet Union. The war was won by Artsakh and Armenia, and led to occupation of regions around Soviet-era Nagorno-Karabakh. Azerbaijan and Turkey responded with a transportation and economic blockade of Armenia which persists to this day, while Artsakh was also blockaded until 2023. There were expulsions of ethnic Armenians from Azerbaijan and ethnic Azerbaijanis from Armenia and the Armenian-controlled areas. The ceasefire ending the war, signed in 1994 in Bishkek, was followed by two decades of relative stability, which significantly deteriorated in the 2010s. A four-day escalation in April 2016 resulted in hundreds of casualties but only minor changes to the front line. In late 2020, the large-scale Second Nagorno-Karabakh War resulted in thousands of casualties and a significant Azerbaijani victory. The hostilities subsided with a tripartite ceasefire agreement, under which Azerbaijan captured one-third of Nagorno-Karabakh and regained control over the occupied territories surrounding the region. Ceasefire violations in Nagorno-Karabakh and on the Armenian–Azerbaijani border continued following the 2020 war. Between 2022 and 2023, Azerbaijan escalated its blockade of Nagorno-Karabakh using a military checkpoint, sabotaging civilian infrastructure, and targeting agricultural workers. The ten-month-long military siege isolated the region from the outside world. In September 2023, Azerbaijan launched a large-scale military offensive, expelled the entire population, dissolved the government of Artsakh, and incorporated the territory into Azerbaijan. In August 2025, Azerbaijan and Armenia signed a US-brokered peace agreement in Washington, DC, aiming to end the conflict, reopen transport routes, and normalize relations. Barriers to a comprehensive and lasting settlement include Azerbaijan’s denial of the right of return for displaced Armenians, disputes over Armenians detained, and Azerbaijan's demands that Armenia concede an extraterritorial transit corridor and amend its constitution and national symbols.
Background
Following the breakup of the Russian Empire, the Armenians of Nagorno-Karabakh formed an unrecognised polity known as the Karabakh Council in 1918. Due to Azerbaijani–British pressure, the Karabakh Council in August 1919 was forced to provisionally recognise the authority of Azerbaijan, pending the Paris Peace Conference's adjudication of the international borders of the republics within the South Caucasus. As the peace conference was inconclusive regarding Nagorno-Karabakh, the Azerbaijani governor-general Khosrov bey Sultanov, issued an ultimatum to the Armenians of Karabakh in early 1920, stipulating their acceptance of permanent inclusion into Azerbaijan. Leaders associated with the Republic of Mountainous Armenia and the Dashnak Party attempted to organize a rebellion against Azerbaijani rule, which failed and led to the massacre and displacement of Shusha's Armenian population. By 1921, Soviet authorities were in control of Nagorno-Karabakh who decided on the formation of the Nagorno-Karabakh Autonomous Oblast (NKAO) within Soviet Azerbaijan. In 1964, the Armenians of Karabakh sent a letter to leader of the USSR, Nikita Khrushchev, complaining about Azerbaijan's economic management of the region. They also requested that the NKAO and adjacent regions where the Armenian population is approximately 90% be reincorporated into the Armenian SSR or integrated into the RSFSR. The Nagorno-Karabakh Armenian intellectuals who wrote to the Kremlin were imprisoned, put under surveillance, or forced to leave Nagorno-Karabakh. All lost their jobs and were removed from the Communist Party.
Throughout the Soviet period, Azerbaijani authorities implemented policies aimed at diluting the Armenian majority in Nagorno-Karabakh through various means, including border manipulations, encouraging the exodus of Armenians, and settling Azerbaijanis in the region. Census data from the Soviet period reflects these demographic shifts. Shusha—once a major center of Armenian cultural life—became overwhelmingly Azerbaijani. In the 1920s, Armenians constituted 94.4% of Nagorno-Karabagh’s population, with only 5.6% being Azerbaijani; by 1979, Armenians' share had fallen to 76%, while the share of Azerbaijanis had increased to 24%. This discrimination against the Armenian population was part of a part of a broader strategy to suppress Armenian culture and identity in Nagorno-Karabakh. Former Azerbaijani President Heydar Aliyev later admitted to supporting some of these policies. Teaching Armenian history in Nagorno-Karabakh was banned. Nagorno-Karabakh Armenians were persecuted for choosing to attend college in Armenia instead of Azerbaijan or for supporting the FC Ararat Yerevan football club instead of Neftchi Baku. The 1973 Soviet Top League final in which Ararat Yerevan defeated FC Dynamo Kyiv was not aired in Azerbaijan SSR, and Nagorno-Karabakh Armenians that listened to the match by radio were arrested and questioned by the KGB. Despite these pressures, Armenians remained the majority in Nagorno-Karabakh when the USSR collapsed. Amid Mikhail Gorbachev's reforms the dissolution of the Soviet Union in 1988–89, a 1988 Nagorno-Karabakh referendum was held to transfer the region to Soviet Armenia, citing self-determination laws in the Soviet constitution. In response, a series of pogroms were committed against Armenians throughout Azerbaijan, leading to the start of the Nagorno-Karabakh War. Professor Matt Qvortrup considered it hypocritical that Western Europe countries had eagerly recognised the succession of several states from Yugoslavia, ignoring the laws of territorial integrity, but simultaneously did not show the same interest for the Nagorno-Karabakh referendum, noting "the practice of independence referendums seemingly owes more to national interest than to adherence to principles of jurisprudence". According to Stuart Kaufman, a professor of political science and international relations, and de Waal, the first instance of violence in the conflict occurred in October 1987 when an Azerbaijani official "punished" the Armenian-populated village of Chardakhly with a raid for protesting against the appointment of a new collective-farm director. During the raid, the village's women, children, and elderly were beaten up. In his 2003 book Black Garden, de Waal speculated that "[p]ossibly in reaction to such incidents", Azerbaijanis in Armenia (specifically in the districts of Ghapan and Meghri) were in November 1987 driven out of their homes, arriving at Baku in two freight cars. A number of Armenian scholars and investigative journalists, however, have scrutinized these alleged incidents and argued that, outside the claims made by Azerbaijani officials, there is no evidence, archival or otherwise, to corroborate such instances of mass violence taking place, at least prior to February 1988.
Timeline
First Nagorno-Karabakh War (1988–1994)
The First Nagorno-Karabakh War, also known as the Artsakh Liberation War in Armenia and Nagorno-Karabakh, was an armed conflict that took place in the late 1980s to May 1994, in the enclave of Nagorno-Karabakh in southwestern Azerbaijan, between the majority ethnic Armenians of Nagorno-Karabakh backed by the Republic of Armenia, and the Republic of Azerbaijan. As the war progressed, Armenia and Azerbaijan, then both former Soviet Republics, entangled themselves in a protracted, undeclared war in the mountainous heights of Karabakh as Azerbaijan attempted to curb the Armenian Karabakh movement. On 20 February 1988, the enclave's parliament voted 110-17 in favor of uniting with Armenia. The demand to unify with Armenia, which began anew in 1988, began in a relatively peaceful manner. As the Soviet Union's dissolution neared, the tensions gradually grew into an increasingly violent conflict between ethnic Armenians and ethnic Azerbaijanis. Both sides made claims of ethnic cleansing and pogroms conducted by the other.
The circumstances of the dissolution of the Soviet Union facilitated an Armenian secessionist movement in Soviet Azerbaijan. As Azerbaijan declared its independence from the Soviet Union and removed the powers held by the enclave's government, the Armenian majority of Nagorno-Karabakh voted to secede from Azerbaijan. The referendum held in 1991 was boycotted by the Azerbaijani population and had an electorate turnout of 82.1%, of which 99.9% voted in favor of independence. The referendum resulted in the unrecognized Republic of Nagorno-Karabakh. Full-scale fighting erupted in the late winter of 1992. International mediation by several groups, including the Organization for Security and Co-operation in Europe (OSCE), failed to bring resolution. In the spring of 1993, Armenian forces captured territory outside the enclave itself, threatening to catalyze the involvement of other countries in the region. By the end of the war in 1994, the Armenians were in full control of most of the enclave and also held and currently control approximately 9% of Azerbaijan's territory outside the enclave. An estimated 353,000 Armenians from Azerbaijan and 500,000 Azerbaijanis from Armenia and Nagorno-Karabakh were displaced as a result of the conflict. A Russian-brokered ceasefire was signed in May 1994, leading to diplomatic mediation.
Border clashes (2008–2020)
The 2008 Mardakert clashes began on 4 March after the 2008 Armenian election protests, resulting in several score wounded and killed, with both sides declaring victory. It was the heaviest fighting between ethnic Armenian and Azerbaijani forces since the 1994 ceasefire after the First Nagorno-Karabakh War. Following the incident, on 14 March the United Nations General Assembly by a recorded vote of 39 in favour to 7 against adopted Resolution 62/243, demanding the immediate withdrawal of all Armenian forces from the occupied territories of Azerbaijan. The 2010 Nagorno-Karabakh clash was a scattered exchange of gunfire that took place on 18 February on the line of contact dividing Azerbaijani and the Karabakh Armenian military forces. As a result, three Azerbaijani soldiers were killed and one wounded. The 2010 Mardakert clashes were the deadliest for Armenian forces since the 2008 violence. Between 2008 and 2010, 74 soldiers were killed on both sides. In late April 2011, border clashes left dead three Artsakh Defence Army soldiers, while on 5 October, two Azerbaijani and one Armenian soldier were killed. In all during the year, 10 Armenian soldiers were killed. The following year, continued border clashes between the armed forces of Armenia and Azerbaijan took place from late April through early June. The clashes resulted in the deaths of five Azerbaijani and four Armenian soldiers. In all during 2012, approximately 20 Azerbaijani and 14 Armenian soldiers were killed. Throughout 2013, 12 Azerbaijani and 7 Armenian soldiers were killed in border clashes.
In 2014, several border clashes erupted. By August, 27 Azerbaijani soldiers had died since the start of the year. On 12 November 2014, the Azerbaijani armed forces shot down a Nagorno-Karabakh Defense Army Mil Mi-24 helicopter over Karabakh's Agdam district. With the crash, 2014 became the deadliest year for Armenian forces since the 1994 ceasefire agreement, with 27 soldiers killed. Six Armenian civilians also died in 2014, while by the end of the year the number of Azerbaijanis killed rose to 39 (37 soldiers and 2 civilians). In 2015, 42 Armenian soldiers and 5 civilians were killed as border clashes continued. In addition, at least 64 Azerbaijani soldiers also died, according to Armenian sources. Over the years, propelled by oil and gas revenues, Azerbaijan embarked in a military build-up. In 2015 alone, Baku spent US$3 billion on its military, more than Armenia's entire national budget. In early 2016, the most serious clashes until the 2020 war occurred (the 2016 Nagorno-Karabakh conflict). Between 1 and 5 April 2016, heavy fighting along the Nagorno-Karabakh frontline left 88 Armenian and 31–92 Azerbaijani soldiers dead. One Armenian and three Azerbaijani soldiers were also missing. In addition, 10 civilians (six Azerbaijani and four Armenian) were also killed. During the clashes, an Azerbaijani military helicopter and 13 unmanned drones were shot down and an Azerbaijani tank was destroyed, while Nagorno-Karabakh lost 14 tanks. Continued clashes occurred in 2018. Three civilian volunteers were killed in a demining operation in Nagorno-Karabakh on 29 March 2018. 2020 saw a number of clashes, particularly heavy in July (July 2020 Armenian–Azerbaijani clashes).
Second Nagorno-Karabakh War (2020)
Large-scale fighting began on the morning of 27 September, with an Azerbaijani offensive along the line of contact established in the aftermath of the first war. Clashes were particularly intense in the less mountainous districts of southern Nagorno-Karabakh. On the same day, Azerbaijan's Parliament declared a martial law and established curfews in several cities and regions following the clashes. Turkey provided military support to Azerbaijan, although the extent of this support is disputed. The war was marked by the deployment of drones, sensors, long-range heavy artillery and missile strikes, as well as by state propaganda and the use of official social media accounts in online information warfare. Azerbaijan's widespread use of drones was seen as crucial in determining the conflict's outcome. Numerous countries and the United Nations strongly condemned the fighting and called on both sides to de-escalate tensions and resume meaningful negotiations. Three ceasefires brokered by Russia, France, and the United States failed to stop the conflict. Following the capture of Shusha, the second-largest city in Nagorno-Karabakh, a ceasefire agreement was signed, ending all hostilities in the area from 10 November 2020. Following the end of the war, an unconfirmed number of Armenian prisoners of war were captive in Azerbaijan, with reports of mistreatment and charges filed against them, leading to a case at the International Court of Justice.
Casualties were high. According to official figures released by the belligerents, Armenia and Artsakh lost 3,825 troops, with 187 servicemen missing in action, while Azerbaijan claimed 2,906 of their troops were killed, with 6 missing in action. The Syrian Observatory for Human Rights reported the deaths of 541 Syrian fighters or mercenaries fighting for Azerbaijan. However, it was noted that the sides downplayed the number of their own casualties and exaggerated the numbers of enemy casualties and injuries. The total number of reported civilian fatalities on both sides was at least 185; the whereabouts of 21 Armenian civilians remain unknown. Civilian areas, including major cities, were hit, particularly Stepanakert, Martuni, Martakert, Shushi in the Republic of Artsakh and Ganja, Barda and Tartar in Azerbaijan, with many buildings and homes destroyed.
Border tensions (2021–present)
Border crisis (2021–present)
An ongoing border crisis started on 12 May 2021, when Azerbaijani soldiers crossed several kilometers into Armenia in the provinces of Syunik and Gegharkunik, occupying between 50 and 215 square kilometers. Azerbaijan has not withdrawn its troops from internationally recognised Armenian territory despite calls to do so by European Parliament, United States and France – two of the three co-chairs of the OSCE Minsk Group. Following the end of the Second Nagorno-Karabakh War, Azerbaijan has made numerous incursions into Armenian territory and has regularly violated the ceasefire agreement, provoking cross-border fights with Armenia. In order to strengthen the border against Azerbaijan's military incursions, Armenia allocated additional defense areas to border guards of the Russian Federal Security Service. The crisis escalated in July 2021, with clashes taking place on the Armenia–Nakhchivan border, and in November 2021 in the Gegharkunik–Kalbajar area. In August 2021, Azerbaijani forces blockaded southern Armenia (Syunik) by closing the main north-south highway which interrupted all international transit with Iran and forced Armenia to develop alternative roads. Although the mission has been condemned by Azerbaijan and Russia, the EU has sent a CSDP civilian monitoring mission to Armenia to contribute to stability along the border and deter offensives by Azerbaijan. The president of Azerbaijan, Ilham Aliyev, has made numerous threats to Armenia, making statements such as "Armenia must accept our conditions" if Armenians wish to "live comfortably on an area of 29,000 square kilometers," and "they must not forget that Armenian villages are visible from here." The largest escalation occurred in September 2022, when Azerbaijan initiated its largest attack on the Republic of Armenia in the history of the conflict between the two countries. Since Azerbaijan's offensives, Armenia's borders with Azerbaijan have become militarized which has disrupted the livelihoods of residents in border communities: residents have been targeted and could no longer access farmlands, schools, water resources, relatives, or religious sites. Fearing for their safety, many Armenian villagers have moved away permanently. Armenia has unsuccessfully requested that the Collective Security Treaty Organization (CSTO) and Russia independently intervene due to Azerbaijan's military incursions in May 2021 and September 2022. The CSTO and Russia declined to provide assistance both times.
Blockade of Nagorno-Karabakh (2022–2023)
On 12 December 2022, under the guise of "environmental protests", Azerbaijan launched an illegal blockade of Nagorno-Karabakh. The Azerbaijani government sent citizens claiming to be "eco-activists" to block the Lachin corridor, the only road connecting Artsakh to Armenia and to the outside world. Civil servants, disguised military personnel, members of pro-government NGOs, and youth organisations were among the so-called "eco-activists." Only Azerbaijani journalists from state or pro-government media were permitted past checkpoints into the region. From 26 March to 30 September 2023, the Azerbaijani government consolidated its blockade: seized strategic ground around the Lachin corridor both within Artsakh and Armenia, installed a military outpost that blocked a bypass dirt road that provided relief, blocked the old section of the Lachin corridor, and installed a checkpoint at the new section. Azerbaijan has ignored calls from the Russian peacekeepers to observe the 2020 ceasefire conditions and return to their initial territorial positions. Azerbaijan has also ignored calls from the International Court of Justice, the European Court of Human Rights, and other human rights organizations to restore freedom of movement across the Lachin corridor. The blockade had severe consequences for the population: importation of food, fuel, and medicine was blocked, and the 120,000 residents of the region were trapped, which created a humanitarian crisis. Shortages of food, medicine, and electricity were widespread with emergency reserves were rationed, along massive unemployment and school closures. During the blockade, Azerbaijan has deliberately damaged or cut various critical civilian infrastructure which supplied Artsakh: including gas, electricity, and Internet. The region was without gas from 22 March to 30 September 2023 and Artsakh authorities have resorted to daily 6-hour blackouts in order to ration the limited local electricity production, as Azerbaijan has prevented repair of a damaged supply line. Azerbaijani President Aliyev has said that "Armenians living in Karabakh must either accept Azerbaijani citizenship or look for another place to live" and has threatened military action. Local Armenian residents feared that the blockade aimed to expel them from their homeland and various human rights organizations and scholars specializing in genocide studies have warned of genocide risk factors.
2023 offensive and expulsion of Armenians
On 19 September 2023, Azerbaijan launched a military offensive on Nagorno-Karabakh. One day after the offensive started, on 20 September, an agreement on establishing a complete cessation of hostilities in Nagorno-Karabakh was reached at the mediation of the Russian peacekeeping command in Nagorno-Karabakh. Azerbaijan held a meeting with representatives of the Artsakh Armenian community on 21 September in Yevlakh and a further meeting took place the following month. Ceasefire violations by Azerbaijan were nonetheless reported by both Artsakh and local residents in Stepanakert on 21 September. Following the military offensive, Azerbaijan expelled the entire Armenian population, dissolved the government of Artsakh, and incorporated Nagorno-Karabakh into Azerbaijan.
Azerbaijani resettlement
Following the Azerbaijani reconquest of the region and the expulsion of Nagorno-Karabakh Armenians, Azerbaijan implemented a program to settle Azerbaijanis in the previously-Armenian-inhabited areas.
Fatalities
=== 1988–1994 === An estimated 28,000–38,000 people were killed between 1988 and 1994. Armenian military fatalities were reported to be between 5,856 and 6,000, while 1,264 Armenian civilians were also killed. Another 196 Armenian soldiers and 400 civilians were missing. According to the Union of Relatives of the Artsakh War Missing in Action Soldiers, as of 2014, 239 Karabakhi soldiers remain officially unaccounted for. Azerbaijan stated 11,557 of its soldiers were killed, while Western and Russian estimates of dead combatants on the Azerbaijani side were 25,000–30,000. 4,210 Azerbaijani soldiers and 749 civilians were also missing. The total number of Azerbaijani civilians killed in the conflict is unknown, although 167–763 were killed on one day in 1992 by the Republic of Nagorno-Karabakh's forces.
=== 1994–2019 === Although no precise casualty figures exist, between 1994 and 2009, as many as 3,000 people, mostly soldiers, had been killed, according to most observers. In 2008, the fighting became more intense and frequent. With 72 deaths in 2014, the year became the bloodiest since the war had ended. Two years later, between 1 and 5 April 2016, heavy fighting along the Nagorno-Karabakh front left 91 Armenian (11 non-combat) and 94 Azerbaijani soldiers dead, with two missing. In addition, 15 civilians (nine Armenians and six Azerbaijanis) were killed. Azerbaijan stated 398 of its soldiers and 31 civilians were killed between 1994 and up to September 2020, right before the start of the 2020 conflict. In comparison, the Caspian Defense Studies Institute NGO reported 1,008 Azerbaijani soldiers and more than 90 civilians were killed between 1994 and 2016.
=== 2020–2023 === Between January and September 2020, 16 Azerbaijani and 8 Armenian soldiers, as well as an Azerbaijani civilian, were killed in sporadic clashes. The Second Nagorno-Karabakh War occurred between 27 September and 10 November 2020. According to Azerbaijan, the fighting left 2,906 Azerbaijani soldiers and 100 civilians dead, while six servicemen were still missing. Armenian authorities stated the fighting had left 3,825 Armenian soldiers and 85 civilians dead, while 187 servicemen and 21 civilians were still missing. Additionally, the Syrian Observatory for Human Rights documented the deaths of 541 Syrian mercenaries fighting for Azerbaijan. Two Russian soldiers were also killed when their helicopter was shot down by Azerbaijan by accident while flying in Armenian airspace near the border. In addition, a 13-year-old Russian citizen was killed during an Armenian missile strike on the city of Ganja. In the two-month period fighting, thousands were killed, primarily soldiers, but also an estimated two hundred civilians. Following the end of the war, eleven more Azerbaijani soldiers, six Azerbaijani civilians and one Russian peacekeeper were killed in clashes and landmine explosions in the region by the end of 2020. Twelve Azerbaijani civilians and two soldiers were killed in 2021 by landmine explosions. Seventeen Armenian and ten Azerbaijani soldiers were also killed in shoot-outs in the border area, while 38 Armenian soldiers were captured. Twenty-eight of the captured Armenian soldiers were subsequently released in December 2021. In 2022, three Armenian soldiers were killed and 14 wounded in an attack by Azerbaijani drones in Nagorno-Karabakh on 25 March. During the 2023 Azerbaijani offensive in Nagorno-Karabakh, over 190 Azerbaijani and 190 Artsakh soldiers were killed. 5 Russian peacekeepers were also killed. Subsequently, over 100,000 ethnic Armenian inhabitants of Nagorno-Karabakh were expelled from the region.
Foreign involvement
Countries
Russia
Russia is officially neutral and has sought to play the role of a mediator. In its official statements, Russia calls for a peaceful settlement and restraint during skirmishes. British journalist Thomas de Waal has argued that there is an Azerbaijani narrative that Russia has "consistently supported the Armenian side." According to de Waal, Russia "has more supported the Armenian side," but there have been various "different Russian actors at different times supporting both sides in this conflict." He argues that President Boris Yeltsin did not "want to see the Armenian side be defeated, but he also didn't want to supply them with too many weapons." De Waal concluded in 2012 that "Russia [is] playing both sides", but "ultimately more in the Armenian side." Other commentators have argued that Russia plays both sides in the conflict. Svante Cornell argued in 2018 that Russia "had been playing both sides of the Armenia–Azerbaijan conflict to gain maximum control over both, a policy that continues to this day." During the first Nagorno-Karabakh War, Russia was widely viewed as supporting the Armenian position due to it providing Armenia with military assistance, including arms and indirect logistical support. Russia supplied around $1 billion worth of weapons and, thus, "made a vital contribution to the Armenian victory." According to de Waal, "greater Russian support for the Armenians" was one of the main factors behind the Armenian victory. De Waal notes, "Yet it is not entirely clear how this support for the Armenians was translated on to the battlefield; to complicate things further, the Russians also gave some assistance to Azerbaijan." Following the first Nagorno-Karabakh War and up until 2022, Russia was Armenia's main arms supplier and the two countries are military allies. Russia is sometimes described as Armenia's supporter in the conflict, however, this view is widely challenged as Russia extensively sells arms to Azerbaijan. Also, in February 2022, Aliyev and Putin signed a "Declaration of Allied Interaction" which elevated military ties between their countries and affirms "mutual respect for ... [the] territorial integrity and inviolability of the borders of the two countries" and obliges Azerbaijan and Russia to "refrain from any actions, including those carried out through third states, directed against each other." The agreement also has provisions for joint military operations and assistance between Russian and Azerbaijan, including personnel training and production, maintenance, repair, and modernization of military equipment. However, up until 2022 Armenia purchased Russian weaponry at a discount, while Azerbaijan pays the full price. In 2022, Russia suspended arms deliveries to Armenia.
Turkey
Turkey is widely considered Azerbaijan's main supporter in the conflict. Svante Cornell wrote in 1998 that Turkey is the "only country that constantly expressed its support for Azerbaijan." It provided Azerbaijan "active military help" during the war. Turkey also supports Azerbaijan diplomatically. Turkish and Azerbaijani armed forces cooperate extensively and regularly hold military exercises. Azerbaijan has also bought weapons from Turkey. Turkey closed its border with Armenia in April 1993 after Armenian forces captured Kalbajar. Prior to that, the border was only open "on demand and only for transferring the humanitarian aid (mainly wheat delivery) to Armenia and for the operation of the weekly Kars-Gyumri train, which had been crossing the Turkish–Armenian border since the days of the Soviet Union." Turkey has repeatedly refused to normalize and establish diplomatic relations with Armenia in solidarity with Azerbaijan over Karabakh. Turkey and Azerbaijan signed the "Shusha Declaration" in Shusha, a city that Azerbaijan captured during the Second Nagorno-Karabakh War. The declaration reaffirmed the military and economic cooperation between the countries and Turkish President Erdogan said the opening of a Turkish consulate in Shusha "would be a message to the world and especially to Armenia."
==== Iran ==== Iran is officially neutral and has sought to play the role of a mediator, most notably in 1992. In its official statements, Iran calls for a peaceful settlement and restraint during skirmishes. At the same time, Iranian officials have repeatedly reaffirmed their support for Azerbaijan's territorial integrity. Deputy Foreign Minister Abbas Araghchi stated in 2020 that "While respecting the territorial integrity of the Azerbaijan Republic, Iran is fundamentally opposed to any move that would fuel conflict between the two neighbouring countries of the Azerbaijan Republic and Armenia." During the war, "Iran was domestically torn in devising a policy", but de facto "pursued a policy that combined official neutrality with growing support for Armenia," according to Svante Cornell. Cornell argues that Iran has "pursued policies in the conflict inclined towards Armenia." However, Iran's tacit support for the Armenian side was limited to economic cooperation. Terhi Hakala noted in 1998 that "as a geopolitical counter-weight to Turkey, Iran has strongly supported Armenia, especially by alleviating the effects of the Turkish blockade." Cornell notes that during the war, Iran served as Armenia's "main purveyor of electricity and goods, and once the Armenian conquest of Karabakh had been completed, Iranian trucks began to supply most of the secessionist enclave's needs." According to Bahruz Balayev, "Iran supported the territorial integrity of Azerbaijan and gave some humanitarian aid to the [Azerbaijani] refugees, but in the meantime widely cooperates with Armenia and even Karabakh Armenian authorities." Brenda Shaffer wrote that "Iran's cooperation with Armenia and its tacit support in the conflict with Azerbaijan over Karabagh strengthened Yerevan's actual and perceived power and consequently may have lessened its sense of urgency to resolve the conflict." In 2013, Mohsen Rezaee, who was commander of the Islamic Revolutionary Guard Corps (IRGC) during the war, claimed that he "personally issued an order [...] for the Republic of Azerbaijan army to be equipped appropriately and for it to receive the necessary training." Rezaee added that "Many Iranians died in the Karabakh War. In addition to the wounded, who were transported to [Iran], many of the Iranian martyrs of the Karabakh War are buried in Baku." In 2011, Hassan Ameli, a leading Iranian cleric, claimed that Iran provided Azerbaijan with arms and helped the Afghan mujaheddin move to Azerbaijan. The Iranian embassy in Armenia stated that they would not like unreliable information to affect friendly Armenian-Iranian relations: "We do not exclude the possibility that there are forces, which aim to create hindrances for our friendly relations." In October 2020, several protests erupted in Iranian cities, including the capital Tehran and Tabriz, in support of Azerbaijan, with many Iranian Azerbaijanis chanting pro-Azerbaijan slogans and protesting Iran's alleged arms support to Armenia via the Nordooz border crossing.
United States
Thomas Ambrosio suggested in 2000 that the US "supported Azerbaijan's territorial integrity, but enacted policies that effectively supported Armenia's irredentist policies." Sergo Mikoyan argued in 1998 that the US response to the conflict has been "inconsistent, pulled in different directions by the legislative and executive branches of power." Congress was under the influence of the Armenian lobby, while the executive branch (the White House and the State Department) pursued a pro-Azerbaijani policy, which "reflects Turkish influence and the interests of oil companies." Richard C. Longworth and Argam DerHartunian expressed similar views. Congress's pro-Armenian position was expressed in passing the Section 907 of the Freedom Support Act in 1992, which banned any assistance to Azerbaijan. It was effectively amended by the Senate in 2001 and waived by President George W. Bush starting from 2002. The US provides military aid to both countries. Between 2005 and 2016 Azerbaijan received $8.5 million for counternarcotics assistance and $11.5 million for counterterrorism aid. In the same period, Armenia received only $41,000 for counternarcotics assistance and none for counterterrorism aid. According to EurasiaNet, "Much of the money for Azerbaijan has been targeted toward naval forces, to reduce the risk that it could be used against Armenia." The Trump administration greatly increased the US military aid to Azerbaijan to around $100 million in fiscal years 2018–19, compared to less than $3 million in a year in FY 2016–17. The US aid is primarily "offered in the context of U.S. policy to increase pressure on Iran and focuses on Azerbaijan's Iranian border, but it also has implications for Armenia," according to Emil Sanamyan. In FY 2018, Armenia received $4.2 million in U.S. security assistance. The US has also provided humanitarian aid to Artsakh (some $36 million between 1998 and 2010), including for demining. The humanitarian aid has been criticized by Azerbaijan for legitimizing the "illegal regime in the occupied lands and damages the reputation of the US as a neutral mediator."
=== Arms suppliers === In 1992, the OSCE "requested its participating states to impose an embargo on arms deliveries to forces engaged in combat in the Nagorno-Karabakh area." However, it is a "voluntary multilateral arms embargo, and a number of OSCE participating states have supplied arms to Armenia and Azerbaijan since 1992." The UN Security Council Resolution 853, passed in July 1993, called on states to "refrain from the supply of any weapons and munitions which might lead to an intensification of the conflict or the continued occupation of territory." According to SIPRI, "since 2002, the UN Security Council has no longer listed that it is 'actively seized of the matter'. As such, since 2002, it is assumed that the non-mandatory UN embargo is no longer active."
==== Armenia ==== Russia has long been Armenia's primary arms supplier. Smaller suppliers include China, India, Ukraine, Greece, Serbia, Jordan (per Armenian MoD sources, denied by Jordan). In March 1992, Yagub Mammadov, chairman of Azerbaijani parliament, accused Syria and Lebanon of supplying weapons to Armenia.
==== Azerbaijan ==== According to SIPRI, Russia supplied 55% of Azerbaijan's weaponry in 2007–11, 85% in 2010–14 and 31% in 2015–19. Israel has become a major supplier, accounting for 60% of Azerbaijan's arms imports in 2015–19. Azerbaijan's other suppliers include Turkey, Belarus, Canada (via Turkey), Ukraine, Serbia, and Czech Republic (denied by the Czech authorities).
=== Foreign fighters === Several foreign groups fought on both sides in the intense period of fighting in 1992–94. According to Human Rights Watch (HRW), both sides used mercenaries during the war, namely "Russian, Ukrainian, and Belorussian mercenaries or rogue units of the Soviet/Russian Army have fought on both sides."