After an offensive by the separatist forces of theDonetsk People's Republic in August 2014 during thewar in Donbas, in southern Donetsk Oblast, the river became the boundary between Donetsk People's Republic-controlled territory to the east, and Ukrainian government-controlled territory to the west.[2] A Donetsk People's Republic unit was named theKalmius Brigade after the river.[3]
Under decommunization laws, the city of Komsomolske was renamedKalmiuske in May 2016[4] after the river. However, the Ukrainian government does not control Kalmiuske, and the new name is not recognized by the pro-Russian occupation authorities.[citation needed]