https://arstechnica.com/information-technology/2020/11/wargames-for-real-how-one-1983-exercise-nearly-triggered-wwiii/

"Let's play Global Thermonuclear War."

Thirty-two years ago, just months after the release of the movie WarGames, the world came the closest it ever has to nuclear Armageddon. In the movie version of a global near-death experience, a teenage hacker messing around with an artificial intelligence program that just happened to control the American nuclear missile force unleashes chaos. In reality, a very different computer program run by the Soviets fed growing paranoia about the intentions of the United States, very nearly triggering a nuclear war.