République populaire de Donetsk
After an offensive by the separatist forces of the Donetsk People's Republic in August 2014 during the War in Donbass, in southern Donetsk Oblast the river became the boundary between Donetsk People's Republic-controlled territory on the east bank of the river, and Ukrainian government-controlled territory on the west bank. A Donetsk People's Republic unit was named "Kalmius" Battalion.