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President of the Soviet Union

The president of the Soviet Union, officially the president of the Union of Soviet Socialist Republics, abbreviated as president of the USSR, was the head of state of the Union of Soviet Socialist Republics from 15 March 1990 to 25 December 1991.... Wikipedia
Final holder: Mikhail Gorbachev
Style: Mr. President; (informal); His Excellency; (diplomatic); Comrade Supreme Commander (military)