"What we proposed was not the removal of all sanctions, but the partial removal", Foreign Minister said through an interpreter in Hanoi.
Trump's former United Nations ambassador Nikki Haley said on Twitter that "Americans know the cruelty that was placed on Otto Warmbier by the North Korean regime". Kim and his evil regime are responsible for unimaginable cruelty and inhumanity.
Trump said that "something very bad happened" to Warmbier, but that he didn't believe Kim knew about it or would have allowed it to happen.
"I was telling the generals, I said: Look, you know, exercising is fun and it's nice and they play the war games". In July, Trump refused to blame Russian President Vladimir Putin for interfering in USA election.
Trump's comments about Warmbier brought swift condemnation from congressional Democrats, who took it as the latest example of the president accepting denials from autocratic leaders, including Russia's Vladimir Putin and Crown Prince Mohammed bin Salman of Saudi Arabia.
Vice Foreign Minister Choe Son-hui later said the North Korean leader appeared confused by the Americans' "calculus" as she watched the meetings Wednesday and Thursday.
Trump and Kim ended their summit in Hanoi on Thursday without a deal, with the two sides at an impasse over the sanctions imposed on the North.
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Some families of Japanese nationals abducted by North Korea demanded on February 28 that Japan negotiate directly with Kim Jong Un following the failed talks between the North Korean leader and U.S. President Donald Trump. "No excuses or lavish praise can change that".
"Japan completely supports President Trump's decision not to make concessions easily and to continue constructive talks to urge North Korea to take concrete steps", Abe told reporters, according to a Kyodo News translation.
The Trump administration arranged Warmbier's transfer out of the country, but he died about a week later after falling into a vegetative state.
"It was all about the sanctions", Trump told a news conference after the talks were cut short.
"The top leaders of the two countries appreciated that the second meeting in Hanoi offered an important occasion for deepening mutual respect and trust and putting the relations between the two countries on a new stage", it said.
Both North and South Korea are united in their shared resentment of Japan's brutal 1910-45 colonial rule over the peninsula.
Other DPRK officials also contradicted Trump's assertion that nuclear and missile tests would stay suspended - at Kim's request.