South Korea and the United States have agreed to maintain close cooperation to improve inter-Korean relations,... in a way that helps restart the nuclear dialogue between North Korea and the U.S.<br />According to Seoul's foreign ministry on Friday,... the two sides had a working-group session in Washington on Thursday, local time,... their first face-to-face since the Hanoi summit ended prematurely.<br />Multiple sources say they agreed on a sanctions waiver required for video reunions for war separated families.<br />The State Department also said Seoul and Washington discussed efforts to achieve the North's final, fully verified denuclearization through the implementation of UN Security Council resolutions. <br />