Wounded Russian soldiers are being sent to Ukraine to fight despite their injuries, according to a report.
Soldiers with damaged lungs and shrapnel wounds have been returned to the frontline.
The presidential Human Rights Council in Russia is investigating the matter, a council member said.
There have also been cases of soldiers receiving treatment for ulcers, heart attacks, and strokes being sent back to Ukraine, she said.
In November, Army Gen. Mark Milley, the highest-ranking US military officer, estimated that "well over" 100,000 Russian soldiers had been killed or wounded in the war in Ukraine, according to The Washington Post.