Senior officials of Japan and the United States agreed Wednesday to step up efforts to prevent the spread of weapons of mass destruction.
Undersecretary of State John Bolton, who oversees arms control policy, met with his Japanese counterpart, Yukiya Amano, to discuss WMD nonproliferation and arms reduction, following the recent discovery of a Pakistani-led nuclear trading network.
Bolton said a recent confession by Abdul Qadeer Khan, the founder of Pakistan's nuclear program, that he leaked nuclear secrets abroad showed there are loopholes in international efforts to tighten control on WMD.