Former abbr. for Russia (4)

I believe the answer is:

ussr

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

I've seen this clue in the Newsday and the Newsday.com.

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