Russian troops have discovered mass graves in Syria's Aleppo, with bodies showing signs of torture and mutilation, the Defence Ministry said.
Dozens of bodies have been uncovered, with some bearing gunshot wounds, according to Ministry spokesman Major General Igor Konashenkov.
While the Syrian war is now largely fought with mortars, tanks, and air power, death has come at close quarters as well.
Human rights observers and the media have recorded numerous examples of massacres and organised torture, perpetrated by the government, opposition, and Islamic State.
The Russian air force has helped Syrian President Bashar Assad and its allies to capture Aleppo, Syria's largest city, after weeks of a siege. Russia has since dispatched military police to the city.
Konashenkov also accused rebels, who controlled eastern Aleppo before they were pushed out earlier this month, of laying multiple booby traps and mines across town, endangering the civilian population.
The Britain-based Syrian Observatory for Human Rights, which gathers information on the conflict through local contacts, said on Sunday that at least 63 Syrian soldiers and militiamen had been killed by such booby traps in east Aleppo since the government took control of it from rebels last Thursday.