ambassador wendy sherman who met kim jong-il when he was part of the clinton administration. and the co-founder of global zero an international organization devoted to eliminating nuclear weapons. let's continue the conversation. in the context of those who are not here, what can this group of leaders who are here do to help deal with the north korean problem or the iranian problem, for example? >> we at global zero believable and i personally believe that if we're able to achieve consensus, if we're able to bring the nuclear states and also the nuclear capable states and obviously this meeting is a group of states that have nuclear materials or access to nuclear materials, if we're able to bring as many of those states together as possible, and if we're able to agree, as i hope this summit will, there will be concrete agreements to safeguard nuclear materials, smuggling, nuclear materials crossing borders and nuclear materials within a country's borders.