Republic of Artsakh significant event Nagorno-Karabakh War
Artsakh, officially the Republic of Artsakh () or the Nagorno-Karabakh Republic (), is a doubly landlocked breakaway state in the South Caucasus whose territory is internationally recognised as part of Azerbaijan. Artsakh controls a part of the former Nagorno-Karabakh Autonomous Oblast, including the capital of Stepanakert. It is an enclave within Azerbaijan. Its only overland access route to Armenia is via the 5 km (3.1 mi) wide Lachin corridor which is under the control of Russian peacekeepers.The predominantly Armenian-populated region of Nagorno-Karabakh was claimed by both the Azerbaijan Democratic Republic and the First Republic of Armenia when both countries became independent in 1918 after the fall of the Russian Empire. A brief war over the region broke out in 1920. The dispute was largely shelved after the Soviet Union established control over the area, and created the Nagorno-Karabakh Autonomous Oblast (NKAO) within the Azerbaijan SSR in 1923. 
In the leadup to the fall of the Soviet Union in the late 1980s, the region re-emerged as a source of dispute between Armenia and Azerbaijan. In 1991, a referendum held in the NKAO and the neighbouring Shahumyan Province resulted in a declaration of independence. Ethnic conflict led to the 1991–1994 Nagorno-Karabakh War. Conflict has sporadically broken out since then, most significantly in the Second Nagorno-Karabakh War.The Republic of Artsakh is a presidential democracy with a unicameral legislature. The country is reliant on and closely integrated with Armenia, in many ways functioning as a de facto part of Armenia. The country is very mountainous, averaging 1,100 metres (3,600 ft) above sea level. The population is 99.7% ethnic Armenian, and the primary spoken language is Armenian. The population is overwhelmingly Christian, most being affiliated with the Armenian Apostolic Church. Several historical monasteries are popular with tourists. They come mostly from the Armenian diaspora, as most travel can take place only between Armenia and Artsakh.Dissolution of the Soviet Union
In the lead-up to the dissolution of the Soviet Union, the Nagorno-Karabakh conflict was revitalised. In 1987–88, a mass movement started in Nagorno-Karabakh and Soviet Armenia calling on the Soviet authorities to transfer the region to Armenia. Starting with the pogrom against Armenians in the Azerbaijani town of Sumgait in February 1988, the conflict became increasingly violent, and attempts by Moscow to resolve the dispute failed. In summer 1988, the legislatures of Soviet Armenia and the NKAO passed resolutions declaring the unification of Nagorno-Karabakh with Armenia, which were rejected by Azerbaijani and central Soviet authorities. In December 1991, the Armenians of Nagorno-Karabakh declared their independence as the Republic of Nagorno-Karabakh with the intention of reunifying with newly independent Armenia. The declaration was rejected by newly independent Azerbaijan, leading to the outbreak of full-scale war with Armenia and Nagorno-Karabakh on one side and Azerbaijan on the other. The First Nagorno-Karabakh War ended with a ceasefire in May 1994, with Armenian forces controlling practically the entire territory of the former Nagorno-Karabakh Autonomous Oblast as well as most of seven adjacent districts of Azerbaijan. The Republic of Artsakh became a de facto independent country, though closely integrated with Armenia, while its territory remained internationally recognised as part of the Republic of Azerbaijan.
The region re-emerged as a source of dispute between Armenia and Azerbaijan. In 1991, a referendum held in the NKAO and the neighbouring Shahumian region resulted in a declaration of independence. The ethnic conflict led to the 1991–1994 Nagorno-Karabakh War, which ended with a ceasefire along roughly the current borders. According to UNHCR, the conflict resulted in over 600,000 internally displaced people within Azerbaijan.Intermittent fighting over the region continued after the 1994 ceasefire without significant territorial changes, while long-standing international mediation attempts to create a peace process were initiated by the OSCE Minsk Group in 1994. From late September 2020 until November, significant fighting resumed and Azerbaijan recaptured territories, primarily in the southern part of the region, as well as the strategic town of Shushi. A ceasefire agreement signed on 10 November 2020 between Armenia, Azerbaijan and Russia declared an end to the renewed fighting, and established that Armenia would withdraw from remaining occupied territories surrounding Nagorno-Karabakh over the next month. The agreement includes provisions for a Russian peacekeeping force to deploy to the region, with Russian President Vladimir Putin stating that the ceasefire agreement would "create the conditions for a long-term settlement".