It is unheard of, for heads of state to turn on each other PUBLICLY in this manner! Such disagreements are tolerable behind the curtains, certainly  not in the full glare of the cameras. And whatever his limitations - and they are many - Zelensky remains a sitting President. It is absolutely out of place in the world of diplomacy, for a VP - even of a super power - to address him so rudely, in the manner Vance did, again, PUBLICLY! These people do not have class, no panache. The optics, very bad for both Ukraine  and the US. Putin must be having a ball now! The silver  lining in all of these for Kyiv is that the colonial type of agreement to hand its valuable earth resources to the US, may no longer be consummated with this open confrontation. I hope Zelensky, and all leaders, especially in the Global South, draw appropriate lessons from all of these: to always balance their aspirational and operational foreign policy objectives, to not be led astray like the Ukrainian President, who was led into believing his country was going to defeat Russia in the event of a war.