So, what does it really take to reach a deal with the United States?
Even though his aides warned him the North Koreans were proving intractable in preliminary talks, Trump - a self-professed deal artist - still felt there was a chance Kim would prove reasonable at the table.
There has been no comment from Warmbier's parents, who were Trump's guests at the 2018 State of the Union address, when he condemned the "depraved character" of the North Korean state and blamed its "dictatorship" for Warmbier's injuries and death.
In December, Warmbier's parents won a $500-million default judgment against the regime for wrongful death in a US district court in the District of Columbia.
It's what he said in Singapore too, but it pleased Mr Trump who chimed in: "That might be the best answer you've ever heard".
Menendez added that Trump may have squandered what leverage the US has by helping Kim go from "pariah to accepted worldwide leader". What precisely this may have been is unclear, but it is possible that the United States sought access to the suspected Kangson enrichment site, one of North Korea's two covert uranium enrichment plants known to the USA intelligence community.
Just now several of you said the DPRK-US talks have "failed", either observing no agreement was reached or characterizing that as a setback.
The two leaders had been expected to announce progress on denuclearisation of the Korean peninsula and to sign a joint agreement. Soon after, the two leaders separately departed the hotel and Mr Trump left the country ahead of schedule. "Despite Trump's vowing that there may be more meetings in the future, in reality, it will be very hard for Trump to arrange another experimental summit meeting due to mounting domestic opposition as well as his weakening political standing at home".
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The US president frequently dangled the prospect of a brighter economic future for a nuclear-free North Korea, at one point saying there was "AWESOME" potential.
Lawmakers and analysts said renewed talks are vital and argued that Mr. Trump's firm stance in Hanoi gives the USA a stronger hand in the future.
Abe said Trump, at his meeting with Kim in Vietnam, had raised the issue of Japanese citizens abducted by North Koreans agents.
There were also hopes Kim could pledge to destroy North Korea's decades-old Yongbyon nuclear complex, which has always been at the heart of Pyongyang's atomic development but remains shrouded in secrecy - and North Korea has promised to mothball it twice before. But that would leave him with missiles, warheads and weapon systems, Pompeo said.
He said Pyongyang was willing to denuclearise, "but in areas lesser than what we want".
On Wednesday, Trump seemed to suggest that Kim couldn't possibly know what was happening at all of the country's labour camps and prisons.
Bruce Klingner, a former Central Intelligence Agency analyst now with the Heritage Foundation, said, "Washington should emphasize that the negotiating focus must be on denuclearization, upholding United Nations resolutions and USA laws against North Korean violations". Warmbier was in a coma when he was released back to the US and died days later.
This time, Reuters reported that chefs were brought in from North Korea to collaborate with Western chefs to create a menu that was influenced by cuisine from both sides of the world.
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.