[jollybean]

"article 42.7 of the Lisbon treaty obligates other EU members to assist in case of military attack."

It's a sentence in a document.

The legitimacy of these 'mutual defence treaties' is a function of legitimacy on the ground, history, disproportionate power etc..

Wait to see what happens if Georgia joins the EU, then the leader does something dumb, Putin II invades ... will Europea attack? Can they? What will they do? Can they agree on a response? How to coordinate?

EU is a political body with some other aspirations, but the 'Hard Power' is NATO.

Not sure if it matters at this point if Sweden is a member, because I believe that Russia invading Sweden or Finland would be the same thing as invading NATO.