I looked it up, because it's been 10+ years since I read and studied about this. This table includes Russian sources about military deaths during WW2. It puts military deaths from 1939-1945 (on all fronts, not just Russia) in Germany at 5.3mil by highest estimates and Russian military at 8.7 to 11.4mil. Even if we calculate the highest number of deaths for Germany with the high estimate that they list 80% of their forces to th Easter front, that only leaves us with 4.3mil losses for Germany. The field reports that give us the numbers for Soviet losses include only about 12,000 in the far east. That's a disparity of about 3.4 million soldiers.

From what I can tell from the sources, the 8.7mil does not include the estimated 3.5 mil Soviet POWs intentionally starved and executed by the Germans. Those estimates are what drives us up to the 11mil figure. So with the estimated 2.6 million German POWs released, we have a combat loss disparity of 3.5 million still.

Add to this that the Soviet Union also adopted a "scorched earth" policy that could be responsible for 3-9 million civillian deaths. And Stalin absolutely did employ strategies like penal suicide brigades and purge (execute) senior officers for "political unreliability". It's absolutely fair to lay a good portion of the 27 million Soviet WW2 deaths at his feet. Estimates go as high as saying 12 million of those deaths were related to his policies. But even if we use conservative sourcing and give him responsibility for 4-5 million deaths, that still accounts for 17% of all the Soviet WW2 deaths and a total of 2.5% of his 1939 population.