sung-joo, do you want to talk about that a little bit? >> i think it's everybody who is threatened, actually, including north korea itself and china. if you put them in any rank order, i think the country, the party that is more threatened is south korea. not only by the prospect of north korea actually using the nuclear weapons, but also because what it does to the opportunities for north korea to engage in provocative actions, the possibility of accidents, you know, especially because much of this program is secret, and there's no opportunity to unsure nuclear security -- insure nuclear security or safety. what it does to the military balance in general. or what it does to the possibility of a military conflict and so on. next to south korea i think it is north korea and then comes japan and -- because of the proximity, because of the presence of the u.s. military personnel and facilities there. and china itself with approximately not only with the weapons capability, but also the fallout that might come from whatever might happen in no

. >> sung-joo, any comments or? >> i think unilateral concessions would make sense if there is a willingness on both sides to give and take ultimately. and that cannot engage on negotiated settlement, negotiated give-and-take because of a lack of trust or the habit of doing that. in this case i don't think this is the case previously between the united states and the soviet union. i think there is some willingness to reach give-and-take, mostly in the form of reducing their nuclear weapons, for example, but in this particular sense north koreans feel that they need nuclear weapons, they want to use all kinds of excuses and opportunities to keep doing that. and so unfortunately, unilateral concession or give would not be precipitated. so that is a formula we have to think about very carefully. >> just add one thing to add to jessica's very sensible and insightful question. i continue, i believe strongly that by focusing as closely on the nuclear issue as we are now we are ignoring as been suggested by some here and o