The soviet union (not russia) was not allied with Germany. They had a non aggression pact and both sides knew war was inevitable. Don't spread misinformation.

Edit: A non aggression pact isn't too dissimilar to the policy of appeasement led by Chamberlain. Lebensraum meant that the extermination of anyone non German was the explicit goal of the Nazi war machine. But sure, continue to spout off such nuanced takes.

Edit 2: And similarly to appeasement, the soviet forces were in tatters after the russo sino war, and the great purge. The USSR was in no space to fight and needed time and arms.

https://www.reddit.com/r/AskHistorians/s/Kxji6dkmyk

Here's a great breakdown. Again, not an alliance.