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The Soviet and the US both made systems that, while not fully-automated (they still required some human judgment/input), were highly streamlined in the event of a "decapitating" strike.
The Soviet Perimetr ("Dead Hand") system is as close to an automated system as was ever deployed — once activated, if contact was lost to the Kremlin, missiles were meant to be launched from a more remote location. Not full-auto, but close enough.
The (admittedly) translated Russian sources I have read was that Perimtr was designed more to assuage hot heads after Able Archer and Pershing deployment, then actually being operational.
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