The South Korean foreign minister and U.S. state secretary exchanged views on the recent high-level talks between Pyeongyang and Washington during a 90-minute phone call on Monday morning.
Seoul's foreign ministry said the two diplomats agreed to work closely together so that the North Korean envoy's recent visit to the U.S. can successfully lead to the implementation the Singapore joint declaration.
They also discussed their defense cost sharing, and promised to come to an agreement soon over the long overdue issue.
Minister Kang Kyung-wha and Secretary of State Mike Pompeo had initially planned to meet in Davos this week, but that plan got scrapped as Pompeo will not be attending the forum there.