
1) LA Olympics boycotter 2) UN initials 3) UN member 4) UN member through 1991 5) UN nation 6) UN power 7) UN Security Council member 8) US ally in wwii 9) WWII ally 10) Abbreviation on old maps 11) Aka cccp 12) American ally in WWII 13) Apt anagram of Russ 14) Bearish initials 15) Beatles were Back in it
Found on
https://www.crosswordclues.com/clue/ussr

1) Russia
Found on
https://www.crosswordclues.com/clue/ussr

Union of Soviet Socialist Republics.
Found on
http://soviethistory.msu.edu/glossary/

Abbreviation for the former
Union of Soviet Socialist Republics. ...
Found on
http://www.encyclo.co.uk/local/20688

The Union of Soviet Socialist Republics
Found on
http://www.noslang.com/dictionary/u/

The Union of Soviet Socialist Republics originally was comprised of Russia, Belarus, Ukraine and the Transcaucasian Federation (which was divided in 1936 into the Georgian, Azerbaijan and Armenian republics) and eventually grew to encompass 15 republics
Found on
http://www.pbs.org/pov/myperestroika/glossary/

Union of Soviet Socialist Republics (Soviet Union); used for information dated before December 25, 1991
Found on
http://www.translationdirectory.com/glossaries/glossary116.htm

Between 1985 and 1991 the Soviet Union underwent reforms and finally disintegrated; see the history under Russia. In all former 15 republics, viticulture and/or table grape cultivation was and is still practised. These are Armenia, Azerbaijan, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenista...
Found on
https://glossary.wein.plus/ussr

Union of Soviet Socialist Republics. The Soviet Union.
Found on
https://irp.fas.org/world/russia/su_glos.html

Abbreviation for the former Union of Soviet Socialist Republics
Found on
https://www.encyclo.co.uk/local/21221
No exact match found.