Again, a close reading of history needed to tease out the subtleties.
Finland was the only democracy to ally with Nazi Germany. They fought together to expel the Russians from (then) Finnish territory in Karelia.
Finland did not participate in Barbarossa and when the Siege of Leningrad was taking place Finnish armies stood at the border and kept watch. Given their proven ability to take on the Red Army, Finnish support at that phase of the war might have been the difference between Leningrad being held, and it falling... which might have been the difference between Moscow being held, and it falling.
When Germany started to lose, the equation quickly turned to one of land and money for peace.