Clashes erupt periodically in the Nagorno-Karabakh region, and the latest crisis has raised fears of an all-out war.
Nagorno-Karabakh, a mountainous, heavily-forested, landlocked region in the South Caucasus, is at the heart of a decades-long armed standoff between Armenia and Azerbaijan.
On September 27, 2020, the heaviest clashes since 2016 erupted, prompting fears of an all-out war between two former Soviet republics.