Called "Dead Hand" in the West, the theory is that a command and control system measures communications on military frequencies, radiation levels, air pressure, heat and short-term seismic disturbances. If the measurement points to a nuclear attack, the Perimeter begins a sequence that would end in the firing of all ICBMs in the Soviet (now, Russian) arsenal.
Perimeter would launch a command rocket, tipped with a radio warhead that transmits launch orders to Russian nuclear silos, even with the presence of radio jamming. The rocket would fly across the entire length of the country. After a number of test launches to prove the viability of such a command rocket, the Perimeter system went online in 1985.
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