Answer: USSR

AnswerCrossword Clue
USSR"Back in the .."
USSRCold War initials
USSRWorld power
USSR"Back in the .." (Beatles)
USSRLand of bears?
USSR"Back in the ..." (Beatles)
USSRCold War inits.
USSRCold War letters
USSRPre-CIS nation
USSRCold War power
USSRSALT signer
USSR"Back in the ..."
USSRSALT party
USSRCCCP, to us
USSRCold War participant: abbr.
USSR"Back in the ..." (Beatles song)
USSR"Back in the..." (1968 song)
USSRCold-war inits.
USSRSALT participant
USSRCountry that launched Sputnik: Abbr.
USSRCountry in a classic Beatles title
USSR"Miracle on Ice" upset victims
USSRCIS precursor (5)
USSRFormer UN member
USSRRussia, once
USSRWorld power until '91
USSRCountry in a 1969 Beatles song
USSRFormer empire
USSRFormer UN Security Council member
USSRFighter of a brutal and ineffective ten-year war in Afghanistan
USSRGeorgia was part of it: Abbr.
USSRCIS precursor
USSRBloc that included modern Moldova
USSRFederation satirized in "Animal Farm"
USSRL.A. Olympics boycotter
USSRState that was the eventual result of the Russian Revolution: Abbr.
USSRFormer geopolitical initials
USSRFormer UN power
USSRCold War abbr.
USSRCold War participant