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Alexei Kosygin was the Premier of the Soviet Union during the Triumvirate, a period of shared power between him, Leonid Brezhnev, and Nikolai Podgorny. He was responsible for economic policy, while Brezhnev handled foreign affairs and Podgorny focused on domestic affairs. The Triumvirate was a relatively stable period of government for the Soviet Union, and Kosygin was instrumental in the country's economic growth during this time.