I heard from him.
"The North Koreans did not come with anything new", Hayden said on CNN.
"This has shown that the disputes between Washington and Pyongyang remain large and can not be resolved in a single summit", said Cheng Xiaohe, a Korean affairs expert at Renmin University of China.
"This is just a beginning and there may be many difficulties ahead, but we will never go back to the past again and never give up on this bold journey", Moon said.
But analysts said it was a far cry from the breakthrough that president Richard Nixon scored with his visit to communist China in 1972 that ended decades of estrangement between Washington and Beijing.
In follow-up talks on the establishment of new relations, the US and North Korea will likely hold discussions on ending hostilities.
Trump has also expressed the hope that both China and South Korea will play a major part in developing North Korea's economy, something Kim is seeking.
"We will be stopping the war games which will save us a tremendous amount of money", Trump told reporters, adding he had agreed to stop the "war games" because he considers them "very provocative".
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The move appears to be based on the "freeze for freeze" proposal mooted by China, under which North Korea would stop nuclear and missile tests in exchange for a halt to the military exercises.
Despite a year-long stand-off over Seoul's deployment of a U.S. anti-missile shield, China and the South found themselves on the same side last year after Trump threatened the North with "fire and fury" when it tested missiles that Pyongyang said could reach the United States mainland.
"At the same time, there needs to be a peace mechanism for the peninsula, to resolve North Korea's reasonable security concerns", he said.
In an opinion piece in Chinese media, Chung In-moon, a special adviser to South Korean President Moon Jae-in on foreign affairs and national security, said that Beijing's role in the Korean peninsula peace process "will be larger in the future".
Moreover, the Justice Department also issued new stipulations for briefing congressional members and limited the meeting with only the Gang of Eight, which is comprised of eight leaders within Congress who are briefed on classified intelligence matters.
It appears follow-up talks to the North Korea-US summit will be essential, as the agreement reached on Tuesday on North Korea's denuclearization was made at a broad level without details.
Meanwhile, agreements are yet to be reached on the timeframe of North Korea's denuclearization and how this will be achieved in a way that is complete and verifiable.