Space race competitor, for short

This time, we got "Space race competitor, for short" crossword puzzle clue. Next we will look for a few extra hints for Space race competitor, for short, 4 letters answer". Finally, using all gathered information, we will solve Space race competitor, for short crossword definition and get the correct entry.
Similar crossword puzzle definitions: 

Mir launcher;
KGB's milieu;
KGB funder;

Try this 4 letters answer: USSR


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