. >> rose: to the konl united states. is that. >> very much our problem. very much our problem. >> rose: it is our problem as a country. >> rose: what do you say to the incoming president-elect, that this goes to the top of your. >> we've made that clear since we started these conversations, that this goes to the top of the list. that this is a critically important issue. that china needs to understand the importance we attach to it. it's a core interest of ours a to not be threatened by north korea. and that our a lineses and allies need to have confidence that we remain deeply engaged with them as against this threat. and that the north koreans will continue to feel deeper and deeper isolation. >> rose: but that hasn't stopped them from moving forward. and the president told me in germany. every time they make a mistake they learn from it. >> that's true. that's true of prolive raters everywhere. which is why we have been as expolicive as we have been with its neighbor, china, about what we expect not to happen here. >> rose: it has moved to the top rank