cccp

It's the abbreviation in Russian, actually. Союз Советских Социалистических Республик.
USSR is the abbreviation in english. USSR means the United Socialist States of Russia.
The reading is pretty accurate.

слава к Союз Советских Социалистических Республик!
Glory to the United Socialist states of Russia!
CCCP: Союз Советских Социалистических Республик

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