Well, for one Finland did not just broke off Russia in the classic sense (revolution -> fighting off the invaders). Finland declared independence without foreign intervention, Russians left the country after the brief Civil War and Finland just huddled down without intervention in the Russian civil war. Lenin recognized Finland's independence and USSR showed no interest in Finland before WW2.Finland never broke off of Russia?
As for events, again, I'm a one-woman team. I'd like some help...
Furthermore, Germany protected Finland. If Germany survived WW1 it would have Finland in its sphere. And a historical matter: after the Winter War the Soviets asked Hitler permission to attack Finland again. Hitler declined and thus Soviets could not attack.
P.S. I may have come off too rude, but I'd be happy to assist here. Should you come with a coherent history, this mod can turn our quite interesting.