The Donbas or Donbass is a historical, cultural, and economic region on the Russia–Ukraine border, lying predominantly in Ukraine. The vast majority of the Donbas is occupied by Russia as a result of the Russo-Ukrainian war, as the Russian Armed Forces control about 90% of the region as of October 2025. At the last census in 2001, the population of the Donbas region of Ukraine was about 58% ethnic Ukrainian and 38% ethnic Russian.