Donetsk People's Republic
In 2014, Russia invaded and took Crimea from Ukraine, while armed separatists captured government buildings in the Donetsk Oblast. They declared that the Donetsk Oblast was an independent country named the Donetsk People's Republic (DPR). Approximately at the same time, other people started Luhansk People's Republic in Luhansk Oblast. This sparked the war in Donbas, part of the wider Russo-Ukrainian War.