Star Trek: Deep Space Nine1993

Captain Sisko:
[in a debate with a real Romulan official] Maybe you're right. Maybe the Dominion will win in the end. Then the Founders will control what we now call Cardassia, the Klingon Empire and the Federation. So, instead of facing three separate opponents with three separate agendas, you'll find yourselves facing the same opponent on every side. There is a word for that: surrounded.

Vreenak:
[... ] You make some very good points, Captain. But it's still all speculation and theory - nothing that would warrant abrogating our treaty and plunging the Empire into war.

Captain Sisko:
What if I told you that the Dominion is planning a sneak attack on the Romulan Empire at this very moment?

Vreenak:
Mm... I'd want proof.