Once-mighty initials - Crossword Clue

Below are possible answers for the crossword clue Once-mighty initials.

4 letter answer(s) to once-mighty initials

USSR
  1. 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

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