You're completely right, I just didn't mention it as the question I was replying to was just about if an attack would be detected and a counter attack launched.Points 3 & 4 aren't as clear cut as that as a nuclear explosion wouldn't stop it's destruction at Ukraine's border. So I guess it would depend whether any collateral damage extended into neighbouring countries, some of which being NATO members.
not saying they will but the need be too section of every small subsection isn't necessary.