President of the Soviet Union. Officialy, President of the Union of Soviet Sovereign Republics is the title of the head of state and government of the Soviet Union The office was formed on January 1, 1990, prior to which, the head of state of the Soviet Union was the Chairman of the Communist Party. Since the formation, three Presidents have headed the Soviet Union. Because the term president is also used as the title for the heads of the republics, the term "President of Presidents" (Russian: президент президентов, prezident prezidentov) has been used to describe the President of the Soviet Union.