Its about hindsight. Its not about exporting revolution to europe but wishing Stalin had struck a crippling blow to fascist that they couldn’t recover from.

USSR thought incorrectly that the end of the 3rd reich would be the end of fascist aggression, at least for long enough that they could take care of domestic concerns without distraction.

Taking Berlin was only the first leg of defeating the threat of fascism. If Stalin knew what “peace” would look like maybe he would have just kept going instead of letting the fascists regroup and change tactics.

Fascism was on the ropes in 1945. Peace allowed them to turn USSR’s allies into enemies and change tactics to asymmetrical warfare, economic war and dirty war.