M-R was after the publication of Mein Kampf. Hitler had been openly saying he planned to murder the soviets - all of them - for years by the time of the pact. Why, do you think, were the Soviets willing to sign it anyway? Why wasn't there an anti-nazi alliance at the time of M-R? Who else signed treaties with the Nazis and in what order? There's some fascinating history in the lead up to WWII but you have to be willing to actually look into it rather than just looking for excuses to trash talk the USSR.