They are totally buffered from all sides and safe. Finland was sort of allied with the east, so the Iron Curtain may have fallen between. The population is however heavily mixed and all kinds of problem would have arised. The border between Norway and Finland was so heavily guarded in 1950s that it oftentimes made sense to travel to Norway via Sweden. For example Porn and Filthy Anti-Soviet Literature (like Henry Miller) was confiscated at the border.