I don't think there's any way NATO can afford not to respond to the offensive use of nuclear weapons in a war of conquest, just outside their borders, against a

I don't think there's any way NATO can afford not to respond to the offensive use of nuclear weapons in a war of conquest, just outside their borders, against a friendly nation. But as long as it's a small, tactical nuke, I think NATO's response will be conventional, but still big enough to cripple all Russian positions in Ukraine, and possibly more.