2016 Nagorno-Karabakh conflict

The 2016 Nagorno-Karabakh conflict, also known as the Four-Day War, April War, or April clashes, began along the former Nagorno-Karabakh line of contact on 1 April 2016 with the Artsakh Defence Army, backed by the Armenian Armed Forces, on one side and the Azerbaijani Armed Forces on the other. The clashes occurred in a region that is disputed between the self-proclaimed Republic of Artsakh and the Republic of Azerbaijan.

Source: Wikipedia — 2016 Nagorno-Karabakh conflict (CC BY-SA 4.0)