Picture: AAPDonald Trump and Kim Jong-un shared handshakes and smiles during the historic meeting in Singapore.
"It looked good on camera", Oba said, adding that it would still be a relief to the region that relations remain on a positive trajectory.
China has signed up for increasingly tough United Nations sanctions against its isolated neighbor following Pyongyang's repeated nuclear and missile tests, but has always said sanctions should be accompanied by talks for a political resolution.
The problem "cannot be resolved through one summit", he told senior secretaries. It said the U.S.is "committed to provide security guarantees" and that Kim "reaffirmed his firm and unwavering commitment to complete denuclearization of the Korean Peninsula".
In a post-summit interview with ABC's George Stephanopoulos, Trump said North Korea was "going to get rid of certain ballistic missile sites and various other things" but that they would "put that out later".
China shares a border with North Korea and is the country's largest trading partner.
Tuesday morning saw the South Korean President tell a cabinet meeting he "could hardly sleep last night" because of the Trump-Kim summit.
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Trump said, however, that he was willing to stop joint US-South Korea military drills, a key demand from Pyongyang.
That suggested that any lasting benefit to Trump on the world stage or at home will depend on whether, in the next stages of negotiations, he can turn the summit's made-for-TV script into tangible progress toward Pyongyang's nuclear disarmament.
But Chung said that China would not be left out.
In response to Trump's suggestion that an agreement to formally end the Korean War might take place soon, Nam said the Moon administration would not hasten the process and that there was "no timeframe" set for the process.
Trump's supporters, who relish his unconventional diplomatic style, are likely to hail the summit as a foreign policy win for the president over one of America's most bitter long-time foes even as he feuds with Washington's closest allies after leaving an economic summit in Canada in disarray over the weekend.
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.
"This was an opportunity to make a breakthrough and if we missed it, how can we be sure the tensions on the Korean peninsula won't return?" asked Zhu Feng, an worldwide relations specialist at Nanjing University.
The Chicago Council on Global Affairs, in partnership with AP-GfK, conducts a regular survey on foreign policy that includes a series of questions about what actions Americans support or oppose the USA taking to pressure North Korea to stop building its nuclear weapons program. "This may seem far-fetched but it has happened with Vietnam".