Considering that Norway and Greece can be considered to be at "extremes" of Europe and also neighbouring the communist bloc in one way or another, how might the Cold War have played out differently had the two been overrun by the Soviets in World War Two (or subject to communist coups shortly after the war, Czech style) and become part of the Warsaw Pact? I have a few ideas.
1. Much more funding for the Royal Air Force. Norway's possession by the Soviets gives a direct path for their aircraft over the North Sea towards Britain, and one would assume the RAF would be given a greater share of resources to counter this.
2. The Mediterranean becomes a hot zone. Greece would be perfect for its warm water ports and the Soviet Navy would likely rely on it quite a bit. I'd imagine the Mediterranean thus gains a far greater reputation for flashpoints, and that Soviet involvement in the Suez Crisis may well become far more significant as a result.
3. Pro-Soviet stance for Sweden. They're effectively surrounded and they'd likely have to go the same political route as Finland. Thus the Baltic likely becomes a Soviet lake.