It's sort of like the opposite of this idea:
https://en.wikipedia.org/wiki/Roger_Fisher_(academic)#Preven...
> Fisher [...] suggested implanting the nuclear launch codes in a volunteer. If the President of the United States wanted to activate nuclear weapons, he would be required to kill the volunteer to retrieve the codes.
>> [...] The volunteer would carry with him a big, heavy butcher knife as he accompanied the President. If ever the President wanted to fire nuclear weapons, the only way he could do so would be for him first, with his own hands, to kill one human being. [...]
>> When I suggested this to friends in the Pentagon they said, "My God, that's terrible. Having to kill someone would distort the President's judgment. He might never push the button."
> — Roger Fisher, Bulletin of the Atomic Scientists, March 1981[10]
That's so idealistic. We should know by now the reality of power and what kind of people end up in power. Anyone who could climb all the way to the top would kill the volunteer without a second thought, and then go smile on TV.
There should be two knives so the volunteer can defend themselves if they don't think starting a war is worth it.