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
Finland–Sweden border both directions. Because both Finland and Sweden are part of the Schengen area, the border may be crossed anywhere. If the traveller is carrying goods to be declared through customs, the border may still be crossed anywhere, but the traveller must contact customs to declare his/her goods. Through the entire river border, near the eastern shore, the Finnish national road 21/European route E8 runs between Tornio and Kilpisjärvi. The Swedish national road 99 runs near the western shore along most of the border. Bridges across the river border can be found in Karesuvanto/Karesuando (road 959/E45), Muonio (road 954/404), Kolari (road