Perestroika: Perestroika was a policy initiated by Soviet leader Mikhail Gorbachev in the 1980s, aiming to reform and restructure the Soviet economy.
Glasnost: Glasnost means 'openness' in Russian and was another policy introduced by Gorbachev that promoted transparency and freedom of speech within Soviet society.
Warsaw Pact: The Warsaw Pact was a military alliance established in 1955 between several Eastern European countries under Soviet influence as a response to NATO.