Of course not, but we're discussing his use of tactical nuclear weapons. He uses them, he loses. He knows that, which is why he's threatened them, but done nothing.
How can you explain why he hasn't used them yet? He has them, said he would use them, they are also banned, he'd have won the war many times over by now, so tell me why he hasn't? Hundreds of thousands of soldiers lost, military equipment destroyed, financal costs spiralling, yet one nuke would have gained him victory. So tell me why he hasn't used any, if he didn't fear NATO's response?