Dictator Efraín Rios Montt declared himself the president of Guatemala.
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Soviet Space Program's Vega 1, which was launched on December 15, 1984, released a space probe to enter Venus.
A peace treaty was signed between NATO, Yugoslavia, and Serbia.
The first ballistic missile submarine was launched from Groton, Connecticut, US.
Major record label Columbia Records signed singer Bruce Springsteen.
British Parliament was broadcasted live.
