I also believe that, in an issue that further complicates matters, the Romulans would sign a non-aggression pact with the Dominion. Given that they, like the Cardassians, suffered such substantial losses at the hands of the Dominion in "The Die is Cast," the Romulans seem like a perfect candidate for caving under pressure they probably realize they can't afford. It rings very true and represents the Dominion's style, which is to shake up governments with subversive policies instead of simply brute force. Odo's keen observation, "The Dominion is making impressive inroads in the Alpha Quadrant," sums things up rather nicely.