Azerbaijan launches a military offensive against the Republic of Artsakh in the Nagorno-Karabakh region; this leads to the flight of the Armenian population.

Azerbaijan, officially the Republic of Azerbaijan, is a transcontinental and landlocked country at the boundary of West Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by the Caspian Sea to the east, Russia's republic of Dagestan to the north, Georgia to the northwest, Armenia and Turkey to the west, and Iran to the south. Baku is the capital and largest city.

Between 19 and 20 September 2023, Azerbaijan launched a large-scale military offensive against the self-declared breakaway state of Artsakh, a move seen as a violation of 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 Azerbaijani Armed Forces blockading Artsakh, which has resulted in significant scarcities of essential supplies such as food, medicine, and other goods in the affected region.

Artsakh, officially the Republic of Artsakh or the Republic of Nagorno-Karabakh, was a breakaway state in the South Caucasus whose territory was internationally recognised as part of Azerbaijan. Between 1991 and 2023, Artsakh controlled parts of the former Nagorno-Karabakh Autonomous Oblast of the Azerbaijani Soviet Socialist Republic, including its capital Stepanakert. It had been an enclave within Azerbaijan from the 2020 Nagorno-Karabakh war until the 2023 Azerbaijani offensive, when the Azerbaijani military took control over the remaining territory controlled by Artsakh. Its only overland access route to Armenia after the 2020 war was via the five-kilometre-wide (3.1 mi) Lachin corridor, which was placed under the supervision of Russian peacekeeping forces.