Putin the MAD, his desperate threats

Regarding the clearly desperate threats by Putin to use Nuclear Weapons in Ukraine I offer clarity.

What needs to be restated with emphasis on its relevance to today, to it's amplified scope for current conditions and the horrendous end results, is the deterrent policy that got us through the Cold War: MAD.

MAD, for Mutually Assured Destruction. The solemnly assured full strike retaliation by the United States upon any and all adversaries that might use a Nuclear Weapon in a First Strike, thus assuring complete destruction of the aggressor(s).

Essentially, a Doomsday Machine.

No reasonably sane person would instigate such a catastrophe. The fly in the ointment being it is not clear Putin is "reasonably sane". Thus, this Re Declaration needs to be done Publicly, by the President, in a manner that will convey the message clearly and forcefully, to Putin, his underlings and Russian Generals and Admirals. It may be we must count on them being the ones without a Death Wish.