If the Soviets were o do it they couldnt do it efficiently by slugging it out in Finnmark and Lappland. The area is just to void of resources. Roads are limited and the terrain in Norway favours the defender. There is a limited Window of operations due to winter.
Amphibious and airborne ops on a massive scale would have to commence simultanously - or nuclear attacks on population centers. Otherwise the land war would grind on without much gain but hard losses on either side. Assuming the Norwegians have continous airsupport from the USAF and the RAF.
Just a perspektive
