The North Korean government might have also been holding off because it is concerned the summit proposal could fall through, which could be hard to explain to their own public.
Conservative pundits and foreign policy pundits fret that Trump has given Kim recognition that North Korean dictators have sought for decades in exchange for a mere promise to pause missile and nuclear tests.
Xi praised Chung for achieving "positive results" and added that China "actively supports" improving relations between the two Koreas as well as dialogue between the US and North Korea.
Many Democrats as well as Mr Trump's fellow Republicans said the U.S. should have demanded concessions before granting North Korea a meeting.
"I feel they're approaching this matter with caution and they need time to organise their stance".
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He said that no venue for the meeting had been agreed upon.
"It's very early stages".
Yet as of Monday, the Associated Press noted that North Korean media had yet to confirm the meeting.
Japan has expressed its readiness to assist the process of North Korea's denuclearization by covering the initial costs needed for the International Atomic Energy Agency to resume stalled inspections of the North's nuclear facilities. Professor Shi Yinhong, director of People's University's Center for American Studies and adviser to the State Council, lamented that as Trump prepares to meet with Kim Jong Un, China "can only stand on the sidelines and welcome the development, but it can nearly do nothing".
"The offer was made and we've accepted", Sanders said.
Kim has pushed his isolated nation closer to having a nuclear-tipped missile that can strike the USA mainland.
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The president, who wields the power of the bully pulpit, conceded raising the age limit did not have "much" political support. He said on Twitter: "Very strong improvement and strengthening of background checks will be fully backed by White House".
The official also told reporters the South Korean government will give suggestions on the agenda for the talks, according to Yonhap news.
He added: "Should we succeed, there will be dramatic changes in world history, and (South) Korea will have played the leading role".
"But we are determined to keep up the campaign of maximum pressure until we see words match with deeds, and real progress toward denuclearisation".
"I think Thornton (if the nomination is approved) and Lambert in the U.S. will take charge of working-level negotiations with North Korean officials, and Knapper in South Korea will assist", said James Kim, a research fellow at the Asan Institute for Policy Studies.
This image released on March 5, 2018, by the North Korean Official News Service (KCNA), shows North Korean leader Kim Jong Un meeting with South Korean officials in Pyongyang, North Korea.
In Beijing, Mr Xi told Mr Chung that the Korean peninsula faces an opportunity for talks to ease the situation.
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