pn A country in Eastern Europe and Northern Asia. The Country extends from the Gulf of Finland to the Pacific Ocean, and was part of the USSR from 1922 to 1991. Co-official name - Russian Federation, formerly the Russian Soviet Federative Socialist Republic (RSFSR), Capital and largest city Moscow
pn (historical|informal) The Union of Soviet Socialist Republics (a very common name, although more formally Russia, the RSFSR, was one of several constituent republics of the USSR).