This is the facts as it happened. Most of Eastern European countries minus Poland and the Czech side of that republic sided as allies in the attack on the USSR. They lost the war which cost the USSR 20-30 million lives.
You contend that after the war the Soviet army should have packed up their bags and went home afterward and act like all is forgiven? In what fantasy world?
But you want to play what should have happened? How the West should have played its hand? Ok if I was FDR or Churchill I would have said to Stalin - I wish you would not stay but we will not do anything to keep you out of Romania, Bulgaria, Hungry and Slovakia abd Eastern Germany/Austria. Yugoslavia and Greece and Poland are off limits since they were allied nations.
As I have stated time and again I have no hatred of Russians. I do however have no love for either the Czarist government, or the Soviet Union. Nor do I trust Putin at all. It's my fervent wish that the Russians get it right this time, as a stable democratic Russia is in everyones interest.
As to your analysis of the Second World War it's so shallow and limited as to be laughable. For example, you seem to ignore the fact that there were plenty of volunteers from almost every country in Europe who also helped the Germans. Or that the Soviets were quite happy to carve up chunks of Finnland, Poland, occupy the Baltics and annex part of Romania in ALLIANCE with Germany.
To use it to justify Soviet occupation of Eastern Europe, resulting in untoward suffering for millions of innocent people is plain evil. Thank God the USSR is as dead as Stalin.