Deterrence relies on the to-be-deterred believing the deterrence threat. If entrant X is not defensible, it won't be defended, therefore the deterrence value o

Deterrence relies on the to-be-deterred believing the deterrence threat. If entrant X is not defensible, it won't be defended, therefore the deterrence value of accepting entrant X is low. No one -but no one- believes that NATO will fight a war with Russia over Finland, or over Ukraine, or Belarus, or Georgia, or at all. Certainly Putin does not. I assert certainty w/o being a mind reader and not truly knowing what's in going on in his mind, but it's pretty clear to any and all that Germans, French, British, Americans, etc, none of them want a shooting war with Russia even if it could be an easy win because a) it might not be an easy win, b) it might be ruinously costly in blood and treasure even if it were an easy win, c) it might lead to nuclear war where no one wins and everyone loses. If, however, Finland is easily defended, and can defend itself by itself with little extra help from NATO, then that's a deterrence to invasion of Finland regardless of Finland's membership in NATO. I think the experience with the Winter and Continuation Wars makes it pretty clear that Finland can defend itself, at least for some time, so that alone is deterrence against Russia invading Finland. Inviting Finland into NATO would then seem mostly an empty gesture (since we all know NATO won't actually fight Russia), but also a provocative action (see Ukraine). It's lose-lose. It's time for sane thinking to prevail at NATO. The status quo ante-Georgia was fine. The current state of play is not. We got here in large part because of overly-optimistic belief in NATO. Instead of deterring Putin, the inverse happened. The reason is simple: NO ONE believes that NATO would actually fight. Even back in the 80s under Reagan, no one believed any countries other than the U.S. and UK would really fight, but at least Western Europe was defensible and worth fighting for, and the U.S. being willing to fight was deterrence enough. Eastern Europe is now defensible and worth fighting for, and I do believe Poland would fight for itself, and so would other Eastern European countries, but I don't think any would fight for Ukraine, not even if Ukraine had been admitted a few months ago.