Without their sacrifice, the whole world might be ruled by Nazis right now — whatever population was deemed worthy to procreate that is. Much of the world might be nothing but dust in the fields surrounding crematories.
And without Stalin’s oil and assistance how many people Hitler could safely invade Poland, had fuel and resources to fight England and France. Without the Pact between Stalin and Hitler, there might not have been any need for Russian sacrifices. Without their commitment to Hilter, they’d have accepted all the information passed to them that Operation Barbarossa was imminent on 22 Jun 41.
Keep in mind too that Russians have a habit of preferring tyranny over freedom from the Romanovs to the Communitist to Putin. It’s pretty shabby track record. They’ve always preferred to be a nation of drunks ruled by a small clique of thugs. They die young because they’ve no self-control and no common sense. They’re so chauvinistic that they want to stop their weak neighbors for being weak and for scaring Russia. Not a very cool group of people.