I don't know if one is obligated to turn the key, but one is obligated to say that they would turn the key if they were in such a situation.
Should I ever find myself in command of the nuclear arsenal of a country, how I respond to this thread may affect how the leaders of enemy, nuclear-armed nations choose to act towards the country I represent.
Therefore; yes.
Should I ever find myself in command of the nuclear arsenal of a country, how I respond to this thread may affect how the leaders of enemy, nuclear-armed nations choose to act towards the country I represent.
Therefore; yes.