I have a feeling Putin is considering options, but at the same time, he wants to be remembered in history as a 'Winner'; even if he loses. I think that's why he is trying to force the United States to enter, so he could create a winning plan, back out, and blame it on the States. I think he knows the States are not entering, so that's why is still pushing into Ukraine, but its clear the operation is getting worse by the moment.
He is afraid to really to use those weapons, as he wants a victory, but not by mutual destruction.