and why should US/NATO tho ? or does Russia really have to respond with nuclear weapons to say Ukraine ?
Has Ukraine been in such desperation that they lure Russia into nuclear response and hope NATO direct intervention ?
I don't know the exact reasoning of the Russians, but if they can no longer maintain effective deterrence, then shouldn't they assume that NATO will take the opportunity to go for a full out nuclear strike to get rid of the Russian threat? And likewise NATO should assume that Russia is going to go for all out aggression, so they themselves would have to act quickly to eliminate Russia?
Sure, cool minds may prevail and all that, but isn't such reasoning the fundamental logic of deterrence?
Have to remember we've never had such bad relations between major nuclear powers, if there's ever a time when the necessity of deterrence must be taken at face value, isn't it now?