Cobalt Bombs.
Supposedly Russia has had one since the cold war that is considered a "planet killer". Its often referred to as the "dead hand" since it is designed to detonate on its own if a number of radiation monitoring stations stop checking in or see massive spikes in radiation that would be caused by Russia being nuked.
It is a real "MAD" since it would contaminate the entire planet to a point that most complex life would probably die.
Well that’s a charming idea.
The planetary equivalent of taking my ball and going home. Very sophisticated.
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