but cyril, i think this speaks to the gravity of the situation. you have a president who came to power here in may who is really advocating for something like the return to the sunshine policies that were previously had in south korea which meant more engagement, more dialogue with the north there was a big shift in that policy when the conservative government came to power for a ten-year period. then you had a democratic party take over back in may. this president, who so badly wanted dialogue with the north has really been forced to keep his focus on how the up his country's defenses in the face of this mounting and persistent threat from the north. cyril? >> alexandra field reporting live from seoul. thank you very much. and now to iran, which is fighting back against the u.s. president's threats to withdraw from the landmark nuclear deal. the country says it will stop letting international monitors inspect its facilities unannounced if the deal is canceled. let's go to fred pleitgen now in tehran. i guess it's in the hands of the u.s. congress now, fred.