Little doubt remains over the nuclear ambitions of North Korea and Iran. But as new evidence emerges, diplomatic efforts seem stalemated. We look at Iran, North Korea and the politics of nuclear proliferation.
Mike Shuster, NPR's diplomatic correspondent
Ambassador Jack Pritchard, former ambassador and special envoy for negotiations with North Korea for President George W. Bush. Member of U.S. delegation that visited North Korea in January. Now a visiting fellow in foreign policy studies at the Brookings Institution.
Jon Wolfsthal, deputy director for nonproliferation at the Carnegie Endowment for International Peace