so i think there's caution optimism near south korea. but they are keeping a little bit in reserve because just like the rest of us, the south korean government is not sure how this is going to play out. >> we'll have to wait and see. matt rivers live in seoul, south korea. thank you. let's talk more about this now with peter matthews. he's a professor of political science at cypripypress college. again, this on again, off again approach to this summit. is this trumpian theater that we're seeing or some sort of negotiating tacttactic? what do you make of what's happening. >> it's a very dangerous tactic that could explode at any time in the wrong way because diplomacy needs consistency, a measured approach and this way no one knows what's going to happen and the people negotiating with can't really trust you. it's very concerning especially with nuclear weapons in the background. we'll have to see where this