Putin has a real self-esteem problem (that I believe extends to Russia as a nation). In this story, he says about Stalin's butchering millions of people:
President Vladimir Putin said last month that although the 1937 purge was one of the most notorious episodes of the Stalin era, no one should try to make Russia feel guilty about it because "in other countries even worse things happened."
I'm not that familiar with anyone trying to make Russia "feel guilty" about the purges, because Russia isn't supposed to be synonymous any longer with the Soviet Union and Communism. Of course, Putin is doing everything to make them synonymous again, but that's fodder for a longer discussion.
And, one would have to delve deeply into his psychology to explain the notion that guilt shouldn't be felt because "in other countries even worse things happened."