Wagner Group activities in Ukraine

The Wagner Group, also known as PMC Wagner, a Russian paramilitary organization also described as a private military company (PMC), a network of mercenaries, and a de facto unit of the Russian Ministry of Defence (MoD) or Russia's military intelligence agency, the GRU, has conducted operations in Ukraine since early 2014. == Crimea and the Donbas (2014–2015) == Wagner PMCs were first active in February 2014 in Crimea during Russia's 2014 annexation of the peninsula where they operated in line with regular Russian army units, disarmed the Ukrainian Army and took control over facilities.

Source: Wikipedia — Wagner Group activities in Ukraine (CC BY-SA 4.0)