But Trump said Kim had assured him he will continue to hold off on nuclear and missile tests, Reuters reported.
South Korea's presidential office said it was regrettable the second summit ended without a deal, but noted that "meaningful progress" had been made. This wasn't a walk away, like you get up and walk out.
While he won't be there in person, NBA Hall of Famer and "Ambassador of Goodwill to North Kroea" Dennis Rodman wished both Trump and Kim the "best of luck" in a letter he posted to social media on Wednesday.
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House Speaker Nancy Pelosi, a California Democrat, said there was "something wrong" with Trump for choosing to believe "thugs".
In the original White House programme, a "Joint Agreement Signing Ceremony" had been scheduled in Hanoi as well as a working lunch for the two leaders. Trump's closing news conference was moved up and he was expected to depart for Washington ahead of schedule. "Maybe it was for domestic reasons", he said, saying Trump might have sensed due to political and legal trouble at home he "needed a foreign policy win".
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Accusing the Prime Minister of having "misplaced priorities", the Congress said that he was "desperate only for re-election". Whole country has welcomed it. "Glaring case of misplaced priorities!" Congress cancelled its imp CWC & Rally today.
Trump said at the Helsinki summit with Putin past year that the Russian leader was "extremely strong and powerful in his denial" of interfering in the 2016 USA election.
Ri's comments reflected the North Koreans' disappointment, though there was a notable absence of bluster or threats by either side.
"We asked him to some more and he was unprepared to do that", U.S. Secretary of State Mike Pompeo told the news conference, referring to Kim.
He denied Trump's assertion that Pyongyang had demanded the lifting of all sanctions imposed on it over its nuclear weapon and ballistic missile programmes. The North Koreans must be made to see that the USA side has viable options other than accepting whatever Pyongyang offers up. US doctors, after his return home, said Warmbier had suffered extensive loss of brain tissue and "profound weakness and contraction" of his muscles, arms and legs.
He said it is "the biggest denuclearization measure that we can take" given the current status of mutual confidence between the two countries. What the North Koreans did to this US citizen is unacceptable, and I will never condone it.
North Korea's neighbours South Korea and China both said they were disappointed with the outcome.
Progress subsequently stalled with the two sides disagreeing on what that means, as the North sought relief from sanctions and Washington pressed for concrete steps towards it giving up its weapons.
Trump's declaration called to mind other moments when he chose to believe autocrats over his own intelligence agencies, including siding with the Saudi royal family regarding the death of journalist Jamal Khashoggi and supporting Russia's Vladimir Putin's denials that he interfered with the 2016 election.