He led U.S. efforts to tighten export controls against the proliferation of weapons of mass destruction and their delivery vehicles .
During the administration of President George W. Bush , Kang served as the Deputy Assistant Secretary of State for Threat Reduction , Export Controls , and Negotiations .
Kang led U.S. efforts to tighten export controls against the proliferation of weapons of mass destruction and their delivery vehicles .
During the administration of President George W. Bush , Kang served as the Deputy Assistant Secretary of State for Threat Reduction , Export Controls , and Negotiations .