If what they say is true then the universe should not still exist; some random dude off thataways is going to detonate the universe long before anyone can figure out what keeps happening. On the other hand, if they are lying then it is quite simple: "Surrender and let us mind rape you and we will be gentle[1], or we just crush you and take over".
My solution: Shoot the ambassador. Fire on the obvious invasion fleet. Do as much damage as possible and go down fighting. Let the imperialist bastards have to actually work for their conquering.
Who knows? Might even win, they can't be that intelligent if they think anyone is going to fall for that.
[1]: that is what they claim, but they want write access to our minds. Everything they say should be taken in bad faith.
]]>