"Even though our special envoys confirmed his denuclearization will, it is entirely different if the two leaders confirm it directly among themselves and put that into text", Im said.
Asked about the report, a foreign ministry spokeswoman in Beijing said: "We are willing to maintain and strengthen high-level exchanges with the DPRK (North Korea), deepen strategic communication and expand exchanges and cooperation to benefit the people of both countries".
After sharply raising regional tensions with a series of nuclear and missile tests last year, Kim has been reaching out to Seoul and Washington this year, prompting speculation over why he is doing so just as he appears close to achieving his objective of developing nuclear missiles capable of targeting the US mainland.More news: OnePlus 5T gets iPhone X like gestures
Im noted that past agreements to denuclearize were not realized, partly due to lack of USA support or consent. It conducted its most powerful nuclear test past year and has sought to develop a missile capable of hitting the USA mainland.
Noting his meeting with Kim will soon be followed by a meeting between U.S. President Donald Trump and the North Korean leader, Moon said the upcoming summits will mark a "great transition" in the history of the world.
Moon has been reviewing a framework of the statement which could be called the April 27 declaration or the Panmunjom declaration, he said. During negotiations, agreement was reached on holding a meeting of leaders of the two countries.
He stressed that Seoul will therefore make efforts to communicate with the United States as the country and North Korea work on their summit.More news: Freebies to ease the tax deadline pain
A South Korean delegation met with Kim Jong-un in Pyongyang on March 5. But Pyongyang has insisted that the two Koreas should sign a non-aggression treaty and a peace treaty should be signed between North Korea and the US.
Discussions are underway about live coverage of part of the meeting, Im said.
No peace treaty has been signed to replace the 1953 armistice that ended the Korean War, and the US and North Korea have been at loggerheads since formal hostilities ended. He suggested that prospects for nuclear diplomacy would largely depend on what kinds of rewards the United States can offer to the North in return and whether the North will repeat its previous big demands such as the withdrawal of the USA troops in South Korea.More news: Constand Denies Defense Claim She Plotted to Extort Cosby