Vladimir Putin needs no explanation of what used to pass as a nuclear deterrence policy followed by the United States and the Soviet Union during the Cold War.

The Russian dictator reportedly is angry that President Biden has given Ukraine permission to use long-range missiles to strike deeply into Russia as it seeks to defend itself against Putin’s immoral and illegal invasion of its sovereign neighbor.

What is the Russian goon/thug/madman/tyrant/despot threatening to do? He is threatening to use “tactical nuclear weapons” against Ukrainian forces.

Let’s see. How do I say this tactfully? Oh, hell. I can’t.

It would be a mistake of catastrophic proportions!

You see, U.S. and Soviet nuclear deterrence was based on a policy of “mutually assured destruction.” Putin, who once led the Soviet system of spooks, knows the policy as well as any Russian alive today.

Using tactical nukes in the largest ground war in Europe since World War II well could produce a response from NATO — and the United States — that could destroy Russia.

Therefore, I am hesitant to buy fully into the notion that Vladimir Putin has gone MAD.

Then again, Putin did invade Ukraine … and his forces are getting their butts kicked in the field of battle.