Can't break alliance? (slight spoiler)

Basically, I'm trying to blow up the sun with the terror star on mission 9, I guess, but it keeps telling me that I need to break my alliance with the iconians before I can attack them, and I have no option to break my alliance. I don't know how I can beat them mission. In fact, I'm not even 100% sure of the victory conditions because they go off screen, but I know I'm supposed to blow up the planet (or the sun which the planet orbits) with the terror star, right? any help would be appreciated.

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Well, if you restart the mission and hurry up and colonize all planets in that system you won't have that issue. Just make sure you also colonize a planet outside of that system or else you'll get a defeat message after blowing up the star.

Alternatively, you could try to influence flip thier planets to you.

You cannot break the alliance since you are on a team with them.

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