Nagorno-Karabakh conflict

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 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 worked to suppress 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. During the glasnost period, a 1988 Nagorno-Karabakh referendum was held to transfer the region to Soviet Armenia, citing self-determination laws in the Soviet constitution. This act 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. 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. An armistice was established by a tripartite ceasefire agreement on November 10, resulting in Azerbaijan regaining all of the occupied territories surrounding Nagorno-Karabakh as well as capturing one-third of Nagorno-Karabakh itself. Ceasefire violations in Nagorno-Karabakh and on the Armenian–Azerbaijani border continued following the 2020 war. Azerbaijan began blockading Nagorno-Karabakh in December 2022, and launched a large-scale military offensive in September 2023, resulting in a ceasefire agreement. Most ethnic Armenians fled, and Artsakh was officially dissolved on 1 January 2024.