Political map of Europe & the Mediterranean 23 May 2014 (Donbass Rebellion): Following the Russian annexation of Crimea (Accession of Crimea to the Russian Federation), pro-Russian unrest broke out across southern and eastern Ukraine (2014 pro-Russian unrest in Ukraine), demanding referendums. The movement was strongest in the southeastern Donbass region where separatist groups took power in Donetsk and Luhansk (Donbass War).