Lopez : Uranium-based blast would pose new challenge to U.N. . Indicates Pyongyang has advanced centrifuge technologies and related systems . China young leader appears to care little about what U.N. Security Council or North Korea 's think . The opinions expressed in this commentary are solely those of George A. Lopez . Product-based sanctions may stifle the North 's ability to continue nuclear program .
Lopez : Uranium-based blast would pose new challenge to U.N. . Indicates Pyongyang has advanced centrifuge technologies and related systems . China young leader appears to care little about what U.N. Security Council or North Korea 's think . Product-based sanctions may stifle the North 's ability to continue nuclear program .