I will visit Seoul 'any time if you invite me': Kim to Moon

According to the official, Moon told the visitor he could "show you scenes far better than this if you come to the Blue House", with Kim responding: "Really? I will go to the Blue House any time if you invite me." Earlier, on the Military Demarcation Line that delineates the border, Moon asked him: "While you come to the South, when can I possibly go over there?"

After stepping over the line and becoming the first North Korean leader to set foot in the South since the end of the Korean War in 1953, Kim responded: "Why don't we just cross over now?" - prompting Moon's unscripted entry into Northern territory.

Later on, Kim said: "The border is not even that high. Wouldn't it disappear if many people keep walking across it?" Moon expressed hopes that after their summit at Panmunjom, "our meetings will continue at Pyongyang, Seoul, Jeju island and Paektu mountain" -- the island and mountain at the southern and northern ends of the Korean peninsula.

Last year the North carried out a series of missile launches, many of them in the early hours, and its sixth nuclear test, but Kim promised Moon there would be no more. "I heard that you had early morning sleep disturbed many times because you had to attend the National Security Council meetings because of us," he said.

Meanwhile, North Korean leader Kim Jong Un promised to ensure that the agreement reached with the South's Moon Jae-in at a summit on Friday would be implemented, unlike previous pledges.

The two Koreas will closely co-ordinate to ensure they do not "repeat the unfortunate history in which past inter-Korea agreements...fizzled out after beginning," Kim said after a summit with the South's President Moon Jae-in. "There may be backlash, hardship and frustration on our way," he added, "but a victory cannot be achieved without pain".

The nuclear-armed North's pursuit of weapons of mass destruction has seen it become increasingly isolated, subject to a series of UN Security Council sanctions. Panmunjom, where the summit was held in the Demilitarized Zone that divides the two Koreas, was a "symbol of heart-wrenching division", Kim said.

China on Friday heaped praised on the leaders of the two Koreas for holding their landmark summit, calling their handshake over the Military Demarcation Line that divides the peninsula a "historic moment". "We applaud the Korean leaders' historic step and appreciate their political decisions and courage," said the foreign ministry.