NATO and Collective Insecurity - Antiwar.com
Collective security, the official goal of NATO, the North Atlantic Treaty Organization, seems plausible on its face. A group of nations ostensibly concerned about a common threat agree to defend one another in the event of an attack. "All for one and one for all," as the Three Musketeers said.…

Perhaps this is facing up to the difficult question that nobody wants to ask. What if Russia attacks a Nato country, and especially with a tactical nulcear weapons.
This doesn't pertain to Europe alone and so for that reason I'm posting the thread in 'politics'. It would be appreciated if the moderators don't move it, please.
Nato countries can have the security of article 5 but they have to accept the responsibility that comes with it
And injury to one is an injury to all.
An aggression by one is an aggression by all.
Especially America needs to accept that responsibility.