Read any of the books about BRIXMIS and there activities in East Germany during the Cold War. They used to rummage around waste dumps outside military hospitals during the time the Russians were in Afghanistan finding all sort of evidence about what weapons were used there. The Russians used to evacuate their injured into the DDR before they were sent back home. far less evidence of what was happening.
Indeed. The Soviets before and the Russians now have LOTS of experience covering their tracks from their own citizens. To suggest that is impossible in the case of Ukraine (as AreOut did) is laughable.