![PBS NewsHour show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/026/914/small/pbs-newshour-podcast-pbs.jpg)
Summary: Japan said it would relinquish a large cache of weapons-grade plutonium and highly enriched uranium -- enough to build dozens of nuclear weapons -- to the U.S. for disposal, just as a nuclear security summit opens at The Hague. Gwen Ifill assesses the deal with Matthew Bunn of Harvard University.