Unknown Flying Object spottet over Vienna. Nice ship you've got there, I'm really impressed.
Now I did warn you, but you seem to be quite a stubborn species. Well, it's your problem now, not mine.
So, my dear Extraterrestrials (all three of you), you're doomed.
If the UN doesn't get you, then most certainly the US will. And if they will turn out a failure, then we still have the likes of H C Strache - people who don't like foreigners at all and will make sure that you leave for good, although they might haggle for some time as to where to deport you. (I guess we don't have a treaty with Alpha Centauri concerning unwanted foreigners, but they will find a way, don't you worry about that one.)
Serves you right, as you wouldn't take the alternative I did actually offer.