National Security Adviser Wi Sung-lac said Friday that renewed U.S.-North Korea dialogue must make substantive progress on Pyongyang’s nuclear issue. He said Seoul must not be sidelined and that South Korea will coordinate closely with Washington. Wi also linked the talks to a peace framework on the Korean Peninsula and said Seoul seeks constructive cooperation from Beijing.

National Security Adviser Wi Sung-lac speaks about President Lee Jae Myung’s planned trip to the United States and South America during a press briefing at Cheong Wa Dae in Seoul, July 22. Yonhap

National Security Adviser Wi Sung-lac said Friday that any renewed dialogue between the United States and North Korea must produce substantive progress on Pyongyang’s nuclear issue.

Wi also stressed the need to prevent South Korea from being sidelined in the process, emphasizing the importance of close coordination between Seoul and Washington toward that goal.

His comments followed concerns that the U.S. may set North Korea's denuclearization issue aside to restart talks with Pyongyang and that U.S. President Donald Trump's renewed push for a summit with North Korean leader Kim Jong-un may sideline the South.