According to Reuters, men on the photos are pro-Russian separatists from Chechen battalion ‘Death’. The correspondent took the photographs during the training held on the territory of self-proclaimed DNR [Donetsk People’s Republic]. According to the fighters, their battalion fights against Ukrainian Armed Forces and consists of 300 people.
In addition there has appeared a video where people of Caucasus appearance speak about their participation in war in the East and support of terrorist fighters.
According to one of Chechen mercenaries their battalion consists of about 300 people. Every fighter has from 10 to 20 years of combat experience. Most of them are Russian officers of Special Forces that allegedly fight voluntarily.