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What did the Soviet early-warning system mistakenly report in 1983?

U.S. submarine sighting
Missile launch from U.S.
NATO invasion
Spy plane intrusion

Answer

In 1983, the Soviet early-warning system falsely detected a missile launch from the United States. This error was caused by a combination of factors, including a faulty satellite sensor and human error. The incident heightened tensions between the United States and the Soviet Union and raised concerns about the reliability of nuclear early-warning systems.