Operation Manchurian Freedom, known by some local Manchurians as the First Manchurian War, was an armed conflict led by the Union of Sovereign Socialist Republics, consisting of an invasion of the the former Chinese provinces of Manchuria, and a period of occupation and combatance against a dwindling insurgency. The operation began in 1990 with the Siberian invasion of Northern Manchuria, ending in the annexation of the region by the USSR.