Its common sense , do you really think if Finland was not friend with the Germans , they would have not take the country?

They desesperaretetly wanted to have access to the istshmus of Karelia.

The "FOLKSONG" is Significant!

No it isnt ( a folklore song)

and at the end of the war they took more.

Of course that is what happen when you dont agree with Moltov

The folksong was the song that would be sung when the soviets paraded through Helsinki. They even song the folksong in Moscow to show it off before the invasion.

I barely understand why you are obsessed with this folklore song , I went to look more and found that

http://www2.hs.fi/english/archive/news.asp?id=20010907IE5

The extra territory didn't do anything to help defend Leningrad, Finnish forces overwhelmingly took Murmansk with little resistance

Wow that is false!!!

German forces in Finnish territory launched an offensive against the city in 1941 as part ofOperation Silver Fox, and Murmansk suffered extensive destruction, the magnitude of which was rivaled only by the destruction ofLeningrad and Stalingrad.[16][17] However, fierce Soviet resistance and harsh local weather conditions along with the bad terrain prevented the Germans from capturing the city and cutting off the vital Karelian railway line and the ice-free harbor.

For the rest of the war, Murmansk served as a transit point for weapons and other supplies entering the Soviet Union from other Allied nations. This unyielding, stoic resistance was commemorated at the 40th anniversary of the victory over the Germans in the formal designation of Murmansk as a Hero City on May 6, 1985