And yet another example of Trump just blurting things out without thinking things through
Or, he has thought it through and just isn't being honest about it.
The way to avoid the dilemma of "what if both refuse" is to have terms that are extremely favorable to one side so you know they'll agree. That means you only have to worry about applying pressure to the other side. And since Trump already has said publicly that he doesn't think we should be sending money to Ukraine....
It's pretty clear what his actual plan is versus this nonsensical one he just described.
Of course, he's a liar anyway because Ukraine would not simply give in to the Russians in 24 hours even if Trump stopped all aid immediately.