Par, seriously..
Do you believe that if the Finns had not brought the voracious russians to the point of defeat that Stalin would have been satisfied with just Karelia?????
They had no idea when russia attacked them that Germany would soon make russia run away from its ambitions against its former territory.
The Finns under the Great Mannerheim were and remain a lesson in courage against evil at impossible odds.
That doesn't change the fact that they ended the war by acceding to all of the demands of the Soviet - the Baltic island bases demanded, the industrial centers. They fought a wonderful fight, but it was one that they couldn't win - they were cut off on all sides by the end.