The conflict centers on a region disputed for decades.
The mountainous region of Nagorno-Karabakh has long been at the heart of tensions between Armenia and Azerbaijan. Internationally recognized as part of Azerbaijan, but with a majority ethnic Armenian population, it declared independence in the late Soviet period.
A years long war between Armenia and Azerbaijan followed, killing tens of thousands of people and leaving hundreds of thousands displaced. It ended in a 1994 cease-fire that left Armenia in control of Nagorno-Karabakh and seven surrounding districts that were legally part of Azerbaijan. During the war in 2020, Azerbaijan — with powerful Turkish backing including attack drones — recaptured much of Nagorno-Karabakh and the surrounding districts. The death toll was in the thousands, and tens of thousands of people were forced to flee.