I agree with you. The only defence against nuclear weapons is Mutually Assured Destruction and for that to apply both sides need to have nuclear weapons
It's the very fucking reason the North Atlantic Treaty Organisation exists.
To say all NATO allies will not protect each other is as fucking stupid as the people derping on about nuclear war.
Stoltenberg has just issued a statement saying if he attacks one member he attacks all and they are moving more forces to the eastern edge of the alliance.
It doesn't work like that. The treaty means as soon as he invades a Nato country the rest of Nato will actively fight russia with troops etc. There is no ifs or buts about it.