ken goldstein, thank you very much. >> thank you. >> ifill: for more on how the leadership change inth korea could affect u.s. policy toward the isolated nation, we turn to former u.s. ambassador to south korea donald gregg. he's now chairman emeritus of the board of the korea society. and balbina hwang, a visiting professor at georgetown university who was a korea specialist at the state department during the last bush administration. ambassador gregg, the president was in washington saying the u.s. is an asian power. here is the first test. what is the u.s. to do with this chafrng of leadership? north korea? >> well, that's a very good question. i think the timing of his trip to asia was excellent. he ran head on into the growing influence of china and one reason china's influence has expanded is that we have done nothing to talk with north korea in the last two or three years and so the chinese influence has increased as it has become the chief supporter of the north koreans. so we have some things to talk about with the chinese about their role in north korea and the president ha