“These weapons are incredible,” Trump said. “We have to be very careful about letting somebody build them. … You have to be very judicious, but you have to be very careful. … it’s a hard thing to give away that kind of technology, and I don’t think this would ever happen, but, you know, those people that you get that technology, they can someday turn on you. You know, that is possible.”
The real art of the deal is that there is no deal until he decides that there is one. When that happens, the deal springs instantly into existence under whatever terms he wants (strongly/powerfully/etc.) and you are immediately in breach.