Kremlin: A historic fortified complex located in Moscow that serves as the official residence of the President of Russia. It also houses several governmental institutions.
Eastern European Revolutions: Refers to a series of anti-communist revolutions that occurred in Eastern European countries during 1989-1991 leading to the fall of communist regimes throughout the region.
Perestroika: A policy introduced by Soviet leader Mikhail Gorbachev which aimed at restructuring and reforming economic and political systems within the Soviet Union in order to address inefficiencies and increase productivity.