Mr Kim mentioned the "prospect" of dialogue between North Korea and the U.S. at a meeting of party officials.
WASHINGTON-President Donald Trump on Monday extended the timetable for his anticipated meeting with North Korean leader Kim Jong Un, saying the summit might not happen until early June.
But the North remained publicly silent for weeks after its leader's invitation to talks was first delivered to Trump by South Korean officials.
North Korea has said over the years that it could consider giving up its nuclear arsenal if the United States removed its troops from South Korea and withdrew its so-called nuclear umbrella of deterrence from South Korea and Japan. The South Korean president's office announced that Seoul and Pyongyang had reached a historic agreement on holding the third ever summit of the countries' leaders in late April. Prior to being named to the post, Bolton had long expressed hawkish views about North Korea, even advocating a pre-emptive military strike.
The North Korea-China meeting came ahead of the meeting with South Korea, which will take place in the Demilitarized Zone (DMZ) that separates North and South Korea.
Administration officials say the North has communicated that Kim is ready to discuss his nuclear weapons program.
Trump, who has exchanged bellicose threats with Kim in the past year, surprised the world by quickly agreeing to meet Kim to discuss the crisis over Pyongyang's development of nuclear weapons capable of hitting the United States.
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Meanwhile, unnamed USA officials have said for the first time that North Korea told them in behind-the-scenes contacts it is willing to talk about dismantling its nuclear program.
"North Korea, by the way, as you've probably seen - and we've been in touch with North Korea - we'll be meeting with them sometime in May or early June", he said.
Trump said the planned meeting with Kim "will be exciting, I think, for the world".
"He made a profound analysis and appraisal of the orientation of the development of the north-south relations at present and the prospect of the DPRK-U.S. dialogue", KCNA said in an English-language version of the report.
It is scheduled to take place without the months of groundwork that usually precedes such meetings.
Beyond that, a detailed agenda for the talks will need to be set.
The official accompanied the North's Foreign Minister Ri Yong-ho at a ministerial-level meeting of the Non-Aligned Movement (NAM) in Baku, Azerbaijan, last week.