the Swedes also remained neutral in WWII. now, granted, Norway also wanted to remain neutral, but this naturally became rather difficult when Germany invaded us...
but Sweden remained neutral, and some call this the Swedish Sin. they let Norwegians seek refuge there but also didn't resist the Nazis.
Norway was seen as important to the Nazis because it was a convenient place to invade Britain from. also, we made heavy water, considered to be important for the development of the Nazi atomic bomb. Norwegian resistance fighters, collaborating with Scotland, sabotaged that by blowing up the plant that manufactured it though, considerably hampering the Germans' efforts in that regard.