WordNet sense 1 (formerly the largest Soviet Socialist Republic in the USSR occupying eastern Europe and northern Asia):

Soviet Russia, Russian Soviet Federated Socialist Republic

WordNet sense 2 (a federation in northeastern Europe and northern Asia; formerly Soviet Russia; since 1991 an independent state):

Russian Federation

WordNet sense 3 (a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991):

USSR, Soviet Union, Union of Soviet Socialist Republics