Actually CG, I never whined about you breaking truce. Just found you stupid for doing it early. I know very well, your word can only be trusted as long as it arranges you. (Not a bad thing though. Same applies to me an Terenos).
As for attacking you last turn... Well we had nothing to prove the aliens attacked. I tried contacting the Pewnet and didn't get an answer. Our scientists didn't detect anything (Come on, a space war in low orbit and not a flash?) I was convinced you were just looking for an excuse to delay us. And given CG's previous behavior, you can hardly blame me.
Now, as for peace to fight the aliens menace, you ruled it out yourself a few turn ago. Which I can understand: except if they come in this turn or the next, you have a fair chance of disposing of us before they come.
There is no trust. The turn-based, fast-paced nature of this game means that getting owned once carry a really heavy price tag. For us, it'd mean death, as we're still the underdog here.
Actually, I think the only way to prepare for an alien invasion now would be to fund a neutral organization, X-COM style. Of course, it wouldn't be run by any of us, but would be run jointly (like the CIS was for a short time in Countries @ War). We could agree to earmark some percentage* of our income for X-COM. That way, wether we continue warring or not has no impact on our planet's defense. The relative balance of power doesn't change. Hell, we could be at the same time allies and ennemies, fighting each other and the aliens. :p
*We may start with as low as percentage as 20% but we'll soon need at least 60-70% for planet defense.