The South Caucasus region has been a flashpoint since Nagorno-Karabakh declared independence from Azerbaijan after the fall of the Soviet Union, sparking a war between Armenia and Azerbaijan over the territory that resulted in the deaths of tens of thousands of people in the 1990s.

In 2020, with the backing of Turkey, Azerbaijan reignited the long-simmering conflict by invading Nagorno-Karabakh. The six-week conflict ended in Azerbaijan seizing control of Nagorno-Karabakh.

A critical humanitarian situation developed in Nagorno-Karabakh this year after Azerbaijan began to restrict access to the Lachin Corridor, the sole road connecting the breakaway region to Armenia, in December 2022, cutting off access to food and medical aid.

The Azeri government on Tuesday called the strikes “anti-terror measures” against “illegal Armenian military formations.” Azerbaijan said the attacks will not stop until the ethnic Armenians completely surrender.

Nagorno-Karabakh’s “Artsakh Defense Forces” reported 23 civilian injuries and two deaths on Tuesday after the Azeri military unleashed artillery and mortar strikes on both military and civilian positions.

The military escalation marks the first indication of a large-scale outright military conflict in Nagorno-Karabakh since 2020.