The Soviet Union (USSR) occupied most of the territory of the Baltic states in its 1944 Baltic Offensive during World War II. The Red Army regained control over the three Baltic capitals and encircled retreating Wehrmacht and Latvian forces in the Courland Pocket where they held out until the final German surrender at the end of the war. The German forces were deported and the leaders of Latvian collaborating forces were executed as traitors. After the war, the Baltic territories were reorganized into constituent republics of the USSR until they declared independence in 1990 amid the dissolution of the Soviet Union in 1991.