Republic of Artsakh
Armenia and Azerbaijan have disputed the area since 1918. After the Soviet Union established control over the area, in 1923 it formed the Nagorno-Karabakh Autonomous Oblast (NKAO) within the Azerbaijan SSR. In the final years of the Soviet Union, Armenia and Azerbaijan started to dispute the region again. This dispute caused the Nagorno-Karabakh War from 1993 to 1994.