Mr. Moon told reporters Sunday that Mr. Kim at a meeting at the Demilitarized Zone that separates the two Koreas “again made clear his commitment to a complete denuclearization of the Korean Peninsula.” According to Mr. Moon, the North Korean leader said he’s willing to cooperate to end confrontation and work toward peace for the sake of a successful North Korea-U.S. summit.

Mr. Moon said he told Mr. Kim in return that Mr. Trump has a “firm resolve” to end hostile relations with North Korea and initiate economic cooperation if Pyongyang implements “complete denuclearization.”

According to the State Department, the U.S. team met with North Korean officials at the same DMZ site, the village of Panmunjom. The U.S. delegation reportedly included Sung Kim, U.S. ambassador to the Philippines and a former U.S. special representative for North Korea policy.