Crossword Genius

KGB base (4)

Ross

I believe the answer is:

ussr

(Other definitions for ussr that I've seen before include "Former soviet states" , "Country established in1922 and dissolved in 1991, in short" , "Country established in 1922 and dissolved in 1991, in short" , "Former Soviet Union" , "The Beatles? song 'Back in the . . . .'" .)

I've seen this clue in The Wall Street Journal.
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