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Uranium, that was a very, very positive precedent. so we hope that we see more statements like that this morning. one of the things that they could do this afternoon when they talk about international collaboration is get firm commitments by states to ratify an amendment to a very important document which is the convention on the physical protection of nuclear material. that amendment which requires states to physically protect material at home, that's very important, and it hasn't entered into force even for the united states. so that could also be a very concrete measure that comes out of th...

North korea. >> sharon, when you look at all the heavy hitters here around the president, next to the president, does this send a message? is it a message that's being heard by countries like iran and north korea? is kim jong-il and mahmoud ahmadinejad watching the tube wondering what's going to happen here? >> oh, absolutely. the message is loud and clear that we have over 40 nations who agree that we need to protect this material against nuclear terrorism. the message to north korea and iran consistently has been do not even think about selling nuclear material or nuclear weapons in the case...

That is troubling. we don't know too much about how far al qaeda is along in that process. what we do know, however, is that there is a lot. there is tons of highly enriched uranium. 1600 tons and 500 tons of plutonium worldwide. we need that. that would make awful lot of bombs. we need to make sure that material is adequately secured. >> also too when you look at the number of leaders in this room, we are looking at live pictures right now, sharon, of the president of the united states mingling with various leaders as they get ready to sit down for formal remarks and begin this summit, i'm lo...

Their government would sell to terrorists, perhaps, some of them but are the controls strict enough? let's look at a map. on the one hand, you have iran and north korea, always a concern. there is a lot of worry about what their governments actually are up to. so they fall into somewhat of a category all by themselves. you also have these other countries, russia, pakistan, india, concern that their controls are strict enough, that terrorists or criminals could break in and get their hands on some of that nuclear material. there has been some good news out of the summit. of course, ukraine, a l...

Chemical, radiological, the consequences and impact of a nuclear attack would be the most devastating as well as the most lasting. >> how hard is it really? terrorists first would have to get their hands on nuclear material. as you pointed out, it is all very strictly controlled or at least everyone hopes. if it was stolen by criminals, perhaps, and terrorists got their hands on it. the next challenge they would face is fashioning it into some kind of weapon and being able to deliver it to explode it, if you will, over a city or military base. all of these things will make it a very tough chal...