Moon plans to announce the outcome of his summit with Kim at 10 a.m. on Sunday.

"Kim Jong-un thanked Moon Jae-in for much effort made by him for the DPRK-US summit scheduled for June 12, and expressed his fixed will on the historic DPRK-US summit talks," the KCNA reported in its English language dispatch monitored in Seoul. DPRK stands for the North's official name, the Democratic People's Republic of Korea.

"Kim Jong-un told Moon Jae-in to positively cooperate with each other as ever to improve the DPRK-US relations and establish mechanism for permanent and durable peace," it added.

The potentially historic meeting between Trump and Kim was on the verge of collapse amid growing distrust between the two sides.

Pyongyang apparently felt uneasy about Washington's reported demand for a swift, stringent and unilateral denuclearization, while it favors a "phased, synchronous" approach that has been criticized as an attempt to string out negotiations and wring out more concessions.

The reclusive state was also seen increasingly unnerved as it thought it had made a series of unrequited denuclearization gestures such as a freeze on nuclear and long-range missile tests, and last week's dismantling of its only known nuclear test site, observers said.

At Saturday's talks, the two leaders also agreed to reinstate high-level inter-Korean meeting, which was slated for May 16 but was abruptly cancelled by the North on the day. Pyongyang took issue with the two-week combined air drills between Seoul and Washington that ended Friday.

"The top leaders of the North and the South agreed to hold the North-South high-level talks on coming June 1 and further accelerate the talks of various fields including the ones of military authorities and Red Cross," the KCNA reported.

The two leaders agreed to "meet frequently in the future to make dialogue brisk and pool wisdom and efforts, expressing their stand to make joint efforts for the denuclearization of the Korean Peninsula," it said.

The KCNA said that Moon and Kim also had "in-depth" discussions on the implementation of the Panmunjom Declaration adopted after their first summit held last month.

During their meeting on April 27, they confirmed a shared goal of the "complete denuclearization" of the Korean Peninsula and agreed to push for an official end to the 1950-53 Korean War and a peace treaty. The two Koreas also agreed to halt all hostile acts on land, sea and air and enhance cross-border cooperation.

"Kim Jong-un and Moon Jae-in shared the view that the two sides should trust and take care of with each other and exert joint efforts to make sure that the Panmunjom Declaration reflecting the unanimous desire of all Koreans is implemented at an early date," the KCNA said. (Yonhap)