Churchill and FDR didn't "give" Stalin Eastern Europe because neither of them had it. Hitler did. Stalin took it from him by force. What Churchill and FDR did was recognize that was going to happen and there was nothing they could do to stop it short of starting WWIII.
Yeah, lots of non-Jews died in the Holocaust. Maybe as many or slightly more. Maybe. But over twice as many? I want to see evidence of that, because those numbers are bigger than all of Soviet casualties in the entire conflict--and that includes the invasions of Poland and Finland.