Won. Lost. It's all a matter of perspective. For instance, Russia attacked Poland hand in hand with the Nazi Germans (only nazis there ever were, despite Russian propaganda calling Ukrainians this way). Russians showed they had no spine, trying once again to murder and subdue, like vultures. Eventually they were forced to change sides because Hitler was even more greedy and that move put Russians on the side of the Allies. Nowadays they think of themselves as the saviors of Europe, the enemies of Hitler. They don't like to be reminded that they were his allies, just got cheated and fought back.

Finland wanted to be neutral, but got attacked by overwhelming Russian forces and managed to defend itself pretty well, much like Ukraine is doing now. We could say Finland won, but the history books say something else. Finland continued to fight against Russia when it joined forces with the Allies to fight the Germans, which formally placed it on the side of the Axis, the losing side. Was it the fault of Finland in any way? It wasn't the aggressor, it wasn't the loser, yet it lost and had to give up part of its territories to the country that was the second biggest bully in Europe at the time, the same country that continues to be the biggest bully today, when there's no Third Reich anymore.

IMO Russia formally won WW2, but it shouldn't have. When someone invades your home and shoots you, there are consequences. He can't change his mind during the assault, apologize and bandage your wounds, what's done is already done. Russians invaded countries, killed and raped people and then changed their minds and started playing the victim and the whole world accepted it and allowed them to do what they wanted and have the borders they wanted.