First Nagorno-Karabakh War

The First Nagorno-Karabakh War grew out of late-Soviet ethnic tensions in the Nagorno-Karabakh Autonomous Oblast (NKAO), a majority-Armenian enclave inside the Azerbaijan SSR. In February 1988, the NKAO regional soviet voted to request transfer to the Armenian SSR, triggering protests, pogroms against Armenians in Sumgait (February 1988) and Baku (January 1990), and counter-violence against Azerbaijanis in Armenia and Karabakh. After the dissolution of the USSR in 1991, the dispute escalated into full interstate war between newly independent Armenia and Azerbaijan.

Karabakh Armenian forces, backed by Armenia, declared the Republic of Nagorno-Karabakh (Artsakh) in a December 1991 referendum boycotted by local Azerbaijanis. Heavy fighting from 1992 to 1994 saw the capture of Shusha and the Lachin corridor by Armenian forces (May 1992), followed by offensives that took Kelbajar (1993) and additional districts surrounding Karabakh. The UN Security Council passed four resolutions in 1993 — 822, 853, 874, and 884 — demanding withdrawal of occupying forces and reaffirming Azerbaijan's territorial integrity.

The war produced large-scale displacement: roughly several hundred thousand Azerbaijanis were displaced from Armenia, Karabakh, and the seven surrounding districts, while ethnic Armenians fled Azerbaijan proper. Estimates of combat and civilian deaths commonly cited range around 20,000–30,000.

The conflict ended with the Bishkek Protocol (May 1994), brokered by Russia, Kyrgyzstan, and the CIS Inter-Parliamentary Assembly, establishing a ceasefire that left Armenian forces in control of Karabakh and seven adjacent Azerbaijani districts. Mediation thereafter was led by the OSCE Minsk Group, co-chaired by Russia, the United States, and France, which produced frameworks such as the Madrid Principles but no final settlement. The frozen conflict periodically reignited — notably the Four-Day War of April 2016 — before being decisively reshaped by the Second Nagorno-Karabakh War in 2020.