It's really kind of hard to harm Russia more than it manages to harm itself. Yes, Hitler did manage to kill more Russians than Stalin did, but you could also lay the blame for at least some of that at Stalin's door, through the purges in the thirties.
Yes, I was trying to give Russia at least a little bit of wiggle room there... but honestly, they've done far more damage to themselves than anybody has done to them, pretty much throughout their history.