Wagner Group
The Wagner Group came to prominence during the War in Donbas and the Russian invasion of Ukraine, especially in the Battle of Bakhmut. It helped separatist forces of the self-declared Donetsk and Luhansk People's Republics from 2014 to 2015. Its contractors have apparently taken part in various conflicts around the world—including the civil wars in Syria, Libya, the Central African Republic (CAR), Mali, and Sudan. It usually fights on the side of forces aligned with the Russian government.