April 1 (UPI) -- Deputy Secretary of State Christopher Landau and South Korean First Vice Foreign Minister Kim Hong-kyun agreed North Korea must remain nuclear-free while discussing matters in East Asia via telephone. Landau and Kim discussed "pressing security issues in the region" and "emphasized the American commitment to the complete denuclearization of North Korea," State Department spokesperson Tammy Bruce said in a readout of the phone conversation that occurred Tuesday. Advertisement "