The Romulans no longer exist as the same political entity, and we are in open war with the Klingons.

Let me distill it down; on seeing the Borg Klingons Romulans and Dominion all against us the meeting of admirals must have gone something like this;

"Motion 1; **** the treaty. All in favor?"

*all hands go up*

"Very well. On to motion 2..."