The Defense Army of the Republic of Artsakh (Armenian: Արցախի Հանրապետության պաշտպանության բանակ, romanized: Artsakhi Hanrapetut’yan pashtpanut’yan banak) was the defence force of the breakaway Republic of Artsakh. Established in 1992, it united previously disorganized defence units which were formed in the early 1990s.
It was disbanded on 20 September 2023 under the terms of the Nagorno-Karabakh ceasefire agreement following the 2023 Azerbaijani military offensive.
On 19–20 September 2023, Azerbaijan initiated a military offensive in the disputed Nagorno-Karabakh region which ended with the surrender of the self-declared Republic of Artsakh and the disbandment of its armed forces. Up until the military assault, the region was internationally recognized as part of Azerbaijan but governed and populated by ethnic Armenians.
Before the Second Nagorno-Karabakh War in 2020, the region had an estimated population of 150,000 which decreased in the aftermath of the war. Faced with threats of ethnic cleansing by Azerbaijan and struggling amid a nine-month long blockade, 100,400 ethnic Armenians, representing 99% of the remaining population of Nagorno-Karabakh, fled by the end of September 2023, leaving only a couple of dozen people within the region.
On 19 and 20 September 2023, Azerbaijan launched a large-scale military offensive against the self-declared breakaway state of Artsakh, violating the ceasefire agreement signed in the aftermath of the Second Nagorno-Karabakh War in 2020. The offensive took place in the disputed region of Nagorno-Karabakh, which is de jure a part of Azerbaijan, and was a de facto independent republic. The stated goal of the offensive was the complete disarmament and unconditional surrender of Artsakh, as well as the withdrawal of all ethnic Armenian soldiers present in the region. The offensive occurred in the midst of an escalating crisis caused by Azerbaijan's 10-month-long blockade of Artsakh, which resulted in significant scarcities of essential supplies such as food, medicine, and other goods.
One day after the offensive started on 20 September, a ceasefire agreement described as a written agreement for the surrender of Artsakh was reached at the mediation of the Russian peacekeeping contingent where it was agreed that the Artsakh Defence Army would be disarmed. Ceasefire violations by Azerbaijan were nonetheless reported by both Artsakhi residents and officials until early October. On 28 September, the president of Artsakh, Samvel Shahramanyan signed a decree to dissolve all state institutions by 1 January 2024, bringing the existence of the breakaway state to an end.
On 20 September 2023 a ceasefire agreement ending the Azerbaijani military offensive against the self-proclaimed ethnic Armenian Republic of Artsakh in Nagorno-Karabakh was reached. The agreement was brokered by the Russian peacekeeping contingent stationed in the region since the Second Nagorno-Karabakh War in 2020. Under the terms of the agreement, the Artsakh Defence Army was disbanded. The Russian peacekeepers sheltered at their base camp 2,261 people, of whom 1,049 were children.