National Security & Defense

If he used a tac it would mean a rapid escalation and instant and horrible reaction. There is no point in using a weapon designed to be used against a massed army against the Ukrainian resistance. If he used on on an urban area, it would be WWIII, no doubt in my mind.

Even if a nuclear war was magically limited to a tit-for-tat response, and civilization survived, Russia would not survive as a nation, the rest of the world wouldn't allow it. Russia would be defeated and occupied, like Germany was, until they got their minds right, which would take decades if not centuries. Most importantly for Putin is that he would not personally survive such a stupid move.