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What system reported the false alarm?

Oko
Sputnik
Mir
Vostok

Answer

Oko, the Russian early-warning system, reported a false alarm of an incoming missile attack on November 2, 2019. The system detected a simulated launch of a ballistic missile from Norway, triggering an alert that reached the highest levels of the Russian government. However, the missile launch was later confirmed to be a planned exercise by the Norwegian military, and the alarm was subsequently retracted.