kim jong-un. a professor of korean studies at john hopkins university, how big a deal is this? it has worldwide implications. >> it does, the first time that he sitting u.s.that this will lead to a new chapter in the relationship, and and this hostility that really has characterized the relationship. since the founding of the north korean regime in 1948. >> this is a short summary, face-to-face in less than one h their interpreters, do you think there is the ability here to reach any kind of agreement, or is this more of a first step?>> i think it is more the first step, there is a very long road to go, along the path, and i would hope, this is the first step down the path, eliminating the hostility, perhaps establishing some kind of conversation, i would not expect there to be an agreement today on denuclearization, but again, the path beginning to take steps towards that, and addressing some of north korea's key concerns over the decades, as well as u.s. concerns the region. >> the president has said he would be able to size up kim jong-un in seconds, and he says based on wha