North Korean leader Kim Jong Un remains unsure whether he can trust potential future guarantees of regime security from the United States, South Korean President Moon Jae-in said on Sunday.

Speaking at a news conference a day after a surprise meeting with the DPRK leader, the South Korean President said Kim had at their summit “clearly expressed his firm determination for the complete denuclearization on the Korean peninsula once again.”

“What is unclear for chairman Kim Jong Un is not his willingness to denuclearize,” Moon told assembled media. “But I believe he has concerns on if he can trust U.S. suggestions