FWIW Cenk Uygur who is a die-hard leftist thought the whole thing was triggered by Zelenskyy asking a quesiton to Vance which he thought was improper at meeting, because questions were supposed to come from reporters
He suspects Zelenskyy was PO'd because Trump/Vance wanted a mineral rights deal with no security guarantees. Basically for nothing except maybe continued arms shipments
And I think at this point Zelenskyy is just tired and wants to do away with pretenses as soon as possible so he knows where people stand, and wants that out in the open