I watched a special on that on one of the history channels (implying the Finns were Nazi collaborators - though Germany was the only country willing to help them when the Soviets invaded in the Winter War); when the Finns had won back their pre-Winter War territory, they stopped fighting the Soviets (though some volunteers joined the Germans in continuing into Soviet territory). When the Soviets pushed the Germans back, the Finns were the only Axis-allied country along the Soviet border that kept its independence at the end of the war.
The inaction of the Western Allies to help the Finns in the Winter War (after their inaction against the communists in Spain’s civil war), and then to arm the Soviets throughout WWII, showed exactly why many nations were willing to fight for the Axis; they simply feared communism more than Nazism (and knew the West wouldn’t lift a finger to help them against the former).
Good Finnish movie about the Winter War: Talvisota.
http://www.amazon.com/The-Winter-War-TALVISOTA-ALL-REGIONS/dp/B002QP145C