PabloJ, what nationality are you? (I don't mean that rhetorically or anything. Anyway, I myself am 0% Russian.)
As to them not acknowledging the horrors of Stalin, what about the Khrushchev's "Secret Speech" at the 20th Party Congress, or for that matter all the post-Stalin literature (Anna Akhmatova, Solzhenitsyn) that spoke of the worst horrors of Stalin's reign? Heck, after the fall of communism, that all-time great anti-Stalin muckraker, Solzhenitsyn, was a state favorite all the way through to his death.
What difference does it make when they say "The Great Patriotic War" began? Heck, do we Americans pay any attention to what the Japanese were doing before Pearl Harbor, in spite of it being directly relevant to their decision to attack us?
Regarding Molotov-Ribbentrop, what were they supposed to do, tell the Germans to stick it where the sun don't shine? They had to buy time--if they could afford to build tanks based on selling oil to the people they would use the tanks against, they were willing to do it. And yeah, their oil was used to bomb England, just like Britain's Rolls-Royce engines powered the MiG-15s that we fought in Korea.