A fully leveled Vasari starbase is supposed to successfully assault the other two races' starbases. When the AI uses it, however, it doesn't prioritize the starbase itself. In my case, I had a trade dock on my Advent starbase, causing the offensive starbase to forget what it's doing and shoot the trade drones. Since it appears that the anti-structure weapon bank only hits one target at a time and trade drones spawn fairly frequently, I was able to kill the starbase while only dropping to half health. (screenshot)
