Operation Weserübung's effects on Sweden became strategically encircled by the German-Soviet pact. Since the Baltic states; Estonia, Latvia, and Lithuania; had been forced to accept "limited" Soviet forces on their soil, in the autumn of 1939, they were de facto more or less in a state of occupation. For Sweden and Finland, this meant that the only possible trade route to nations other than Germany and the Soviet Union, was through Petsamo harbour, in the far north of Finland. This seriously hampered the supply situation in both these nations. It also meant that an invasion of Sweden could be launched from almost any direction. Sweden
Sweden–Finland Sweden–Finland Sweden–Finland (, ) is a Finnish historiographical term referring to Sweden from the 12th century to the Napoleonic wars. In 1809, the realm was split after the Finnish war. The eastern half came to constitute the autonomous Grand Duchy of Finland, in personal union with Imperial Russia. The term was coined by Finnish historians during the 1920s, but since then there has been an effort to drop it from professional historiography due to its perceived inaccuracy. However, it is often still used in everyday Finnish speech. Although the term has didactic merits, for instance when used in conjunction with