Also known as Perimeter, Systema Perimetr, GRAU 15E601, Mertvaya Ruka
nuclear-control system used by the Soviet Union and Russia
Inside the Apocalyptic Soviet Doomsday Machine | WIRED
The technical name was Perimeter, but some called it Mertvaya Ruka, Dead Hand.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).