noun /ˈɹʌ.ʃə/
a) 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. Official name Russian Federation, formerly the Russian Soviet Federative Socialist Republic (RSFSR), Capital and largest city Moscow
b) 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).
Wikipedia foundation.