Not only is Perimetr, also known as 'Dead Hand' a real failsafe intended to guarantee full nuclear retalliation in the event of a decapitation strike, it's suspected to still be operational in Real Life long after the Soviet Union's end.
Russia's Cold War-era Perimetr system, which is reactivated and upgraded under President Suvorov's orders after the ECA halts the Russian advance with nuclear warheads.
