5 April – Pravda publishes the article of Alexander Yakovlev "The Principles of Perestroika: The Revolutionism of Thought and Actions", which criticizes Joseph Stalin and supports perestroika.
Reagan and Gorbachev during the Moscow Summit
May
29 May – U.S. President Ronald Reagan visits the Soviet Union. The Moscow Summit takes place. The Medium and Short-Range Missile Reduction Treaty is signed, including OTR-23 Oka as a "bonus for American partners".
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