How do you break alliances with minor races? One minor race has 4-5 mining starbases, and they don't show up in his list of starships, so I can't trade for them. I allied with him earlier on a whim, and now can't figure out how to un-ally so that I can attack him. For normal races, if you're allied with them, the option shows up in that diplomacy window, right next to trade embargo. For the minor race, all I see is trade embargo, with no other diplomatic options.
