Russian military personnel are selling Ukrainian prisoners of war on the “black market” to Chechen militarized groups, who subsequently conduct their own exchanges of captives with Ukraine, according to a report from the Institute for the Study of War (ISW). The agency refers to information from the British daily national newspaper The Times, according to which Ukrainian spokesman Petro Yatsenko of the Coordination Headquarters for the Treatment of Prisoners of War reported that Chechen paramilitary groups are buying Ukrainian prisoners of war from other Russian military units on the “black ma…