friday said his country would not tolerate searches of hits ships understand sanctions > > >>> rosalind jordan joins us now. the issue is a big focus. >> it is a big focus. north korea has steadfastly refused to stop efforts to expand the nuclear weapons programme. there was the underground nuclear test. suspected nuclear test, leading to a round of u.n. security council, and united states sanctions against the country. statements by the south korean leader clearly are not enough to persuade north korea to change course. statements made by the chinese president. noting that north korea's nu nuclear did not change things. it goes to the question of how many countries can be considered nuclear states, states that have the potential capability of using nuclear weapons in conflict with other countries. they all do not want to see north korea become a part of the family. >> in the past we talk about stockpiles and black market. is that relevant? >> it's a relevant question. experts will tell you that the risk of someone acquiring enough speerl to make a dirty bomb, an explosive that would spray rad