Crossword Genius

It's written as "C.C.C.P." in Cyrillic (4)

Ross

I believe the answer is:

ussr

(Other definitions for ussr that I've seen before include "Country established in1922 and dissolved in 1991, in short" , "Former Soviet Union" , "Former soviet states" , "Former union of socialist republics" , "In brief, former Soviet federation" .)

I've seen this clue in The New York Times.
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