Stanislav Yevgrafovich Petrov (Russian: Станисла́в Евгра́фович Петро́в; born 1939 in Odessa, Ukraine[1]) is a retired lieutenant colonel of the Soviet Air Defence Forces. On September 26, 1983, just three weeks after the Soviet military had shot down Korean Air Lines Flight 007, Petrov was the duty officer at the command center for the Oko nuclear early-warning system when the system reported that a missile, followed by another one and another up to five, were being launched from the United States. Petrov judged the report to be a false alarm,[2] and his decision is credited with having prevented an erroneous retaliatory nuclear attack on the United States and its NATO allies that could have resulted in large-scale nuclear war. Investigation later confirmed that the satellite warning system had indeed malfunctioned.[3]​

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