Romeo:

"For a time, the humans of Sera knew the illusion of piece."

And by the way, the lady speaking is the Locust Queen. And the Locust didn't negotiate because war was already in action, they jumped at the chance to finish this new threat in it's weakened state, or at least, that's how I interpret it.

Yeah I want a PIECE of pie.

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Now listen up! Back in my day, we didn't have fancy tanks! We had sticks. Two stick and a rock for the entire platoon! And we had to share the rock! You should consider yourself very lucky marines!