Understood. But that is the obligation of Lurian realms. It's a mutual guarantee of offensive and defensive assistance. The offensive element would come by way of a vote among the realms (in that nobody is declaring war unilaterally and counting on the rest to join in after the fact), but the defensive aid is automatic.
Yea, well, D'Hara wasn't consulted for declaring war against Kabrinskia (well, actually it was, but it opposed it). No votes were held over the subject either.
I don't really see a difference. After all, any sane federation would be bound by the same kinds of restrictions with the obligation of support without allowing any single party to unilaterally bind all others.