jong-un -- even if they haven't carried out the test for tha capable to be reliable if capability setting. it's a slim chance. what we're be looking for in talks is for them to expand into an arm's control regime on the peninsula. so for example, lim tit the numr and location of artillery pieces so that can stand a chance of limiting a possible of conflict on peninsula, that's worth exploring. it's not a slam dunk, but it's better than nothing. >> adam mount with the center for american progress. always a pleasure. thank you so much. >> thank, michael. world leaders voicing concerns about a power vacuum in foreign affairs as the u.s. and president put america first. how tha can make for an interesting g 20 summit. we'll talk about tha next.