Final answer:
Mikhail Gorbachev promoted Glasnost as a policy of transparency and openness in the Soviet government, contributing to the eventual fall of the USSR.
Explanation:
Glasnost was promoted by Mikhail Gorbachev, the last Soviet leader, as part of his efforts to modernize the Soviet system. Glasnost aimed at greater transparency in government activities, allowing public debate and criticism. This policy, along with perestroika, played a significant role in the eventual collapse of the USSR.
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