This is such a great analysis! The sources you used were very good. I do wonder about the likeliness of this however actually happening. Does it have any more substance other than something that Putin just said? I wonder if this is more of a scare tactic than anything, as while there would be expected retaliation, would this necessarily incite nuclear retaliation? I think that it is debatable as there are much more implications with a nuclear attack. But, otherwise, I agree, I think there will be retaliation from the Russian side, but whether or not it will be nuclear is debatable.