They took part in blockade of Leningrad which killed 1 million of civilians only, not counting military casualties. Is it justified?
Yes, due to the strategic importance of the city. You'll note that they refused to deliver the coup de grace or cut the Murmansk railroad, despite German requests.
National survival was at stake? On this basis, all Stalin's actions before and during war can be justified. You condemn defensive pact between USSR and Germany, but Finnish-German alliance was justified? I see.
Stalin's actions during WWII which were taken for the survival of the USSR were justified. Murdering POWs and invading neutral states - which Finland was in the Winter War, and which the Baltics were until he invaded them - are not justified.
The Molotov-Ribbentrop Pact was not a defensive pact, it was a military alliance for the division of Eastern Europe. The Finnish-German alliance, on the other hand, genuinely was a defensive arrangement by the Finns, although it was an offensive one on Germany's side.
Nice of you to completely ignore my point. If Hitler is the devil, then so is Stalin. The two are directly comparable. If anything, Stalin's closer to Satan, considering he was smart enough to survive and remain in power, which Hitler wasn't. I've never heard anyone accuse Satannish of stupidity.
Unintentional mistake, again? Or ignorance?
http://en.wikipedia.org/wiki/Greater_Finland
Most of those territories were taken from Finland by the USSR in the Winter War. Those that weren't could not justifiably be taken from the USSR, except perhaps in the case of plebiscites - not rigged plebiscites, as were held in the Baltics. Regardless, while this may have been the right-wing dream in Finland, it was not Finnish wartime policy, despite what you may like to believe.
Actually, looking at that map again, it includes territory which was part of Finland until after the Continuation War, so either you're ignorant on this subject, or you're lying to me. How could Finland gain territory by invading the USSR that it already had?
No, the Soviets advanced to Finnish territory in 1939-1940 to create more defensible perimeter around Leningrad
No, they invaded a sovereign nation after offering an exchange of territory, which the Finns refused, as was their right. Such a territorial exchange was not in their interest, and they'd seen what happened to the last group of nations who allowed themselves to be pushed around by the Soviets - the Balitc States. Finland had no desire to repeat the process.
The Soviets illegally invaded Finland in an act of aggression. Leningrad already had the perfect buffer zone. Its name was Finland, a neutral nation recognised by the only possible enemy - Germany - as being within Russia's sphere of influence. If you hadn't invaded them, you never would have faced a counter-invasion from their territory a year later.
They withdrew from Soviet territory in 1944, or were just kicked out?
They withdrew. Finnish troops were still in Russian territory when the armistice was signed, and they assisted in clearing the Nazis from said territory afterwards.
And I notice you also ignored the latter part of my post, because if you didn't do so you would have to face the fact that what Finland did was necessary for its own survival, which is something you don't want to face, having likely been indoctrinated to ignore uncomfortable facts like your own nation's
completely unjustifiable past aggression.