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nouna 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 1991part of:
Parts of ussr
- "soviet socialist republic"
- "russian soviet federated socialist republic"
- "russia"
- "caspian sea"
- "soviet russia"
- "caspian"