[Beck]

Sounds like the Sergetti may of had treaties with the Earth Alliance and the Xiati and maybe the Eee and called on them to attack your empire. A partnership with either the Xiati or the Eee with whom you had a partnership would have given all the information about your systems to the Earth Alliance who used this information. It would seem that your attempting to push the Segetti around lead to your being stabbed in the back politically.