HANOI -- U.S. President Donald Trump said on Thursday he had walked away from a nuclear deal at a summit with North Korean leader Kim Jong Un because of unacceptable North Korean demands to lift punishing U.S.-led sanctions.

Earlier, both Trump and Kim had expressed hope for progress on improving relations and on the key issue of denuclearization, in their talks in the Vietnamese capital, Hanoi, their second summit in eight months.

“It was all about the sanctions,” Trump said at a news conference after the talks were cut short. “Basically they wanted the sanctions lifted in their entirety, and we couldn’t do that.”

The United Nations and the United States ratcheted up sanctions on North Korea when the state undertook a series of nuclear and ballistic missile tests in 2017, cutting off its main source of hard cash.

Both Trump and Kim left the venue of their talks, the French-colonial-era Metropole hotel, without attending a planned lunch together, and returned to their hotels.

“Sometimes you have to walk, and this was just one of those times,” Trump said, adding “it was a friendly walk”.

Failure to reach an agreement marks a setback for Trump, a self-styled dealmaker under pressure at home over his ties to Russia and testimony from Michael Cohen, his former personal lawyer who accused him of breaking the law while in office.

Trump said Cohen “lied a lot” during Congressional testimony in Washington on Wednesday, though he had told the truth when he said there had been “no collusion” with Russia.

Since their first summit in Singapore in June, Trump has stressed the good chemistry he has with Kim, but there have been questions about whether the bonhomie could move them beyond summit pageantry to substantive progress on eliminating a North Korean nuclear arsenal that threatens the United States.

'No rush'

While Trump had said he was in “no rush” to strike a deal with North Korea, and wanted to do the right deal with Kim, the White House had been confident enough to schedule a “joint agreement signing ceremony” at the conclusion of talks.

There was no indication of when Trump and Kim might meet again but the White House said the “respective teams look forward to meeting in the future”.

The Singapore summit, the first between a sitting U.S. president and a North Korean leader, produced a vague statement in which Kim pledged to work toward denuclearization of the Korean peninsula.

But little progress followed.

Kicking off their second day in Hanoi, Trump said he would be happy as long as North Korea conducted no more nuclear or intercontinental ballistic missile tests.

North Korea has conducted no nuclear or intercontinental ballistic missile tests since late 2017.

Trump said Kim had promised him there would be no more.

Trump said he and Kim had discussed dismantling North Korea’s main nuclear facility at Yongbyon, which Kim was willing to do, but he had wanted sanctions relief.

“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.

Trump said the United States would be able to inspect some North Korean facilities but he did not go into specifics.

Markets lower

News of the summit failure sent South Korea’s currency lower and knocked regional stock markets. South Korea’s Kospi index closed 1.8 percent lower, marking the biggest one-day percentage loss since Oct 2018.

While Trump indicated a more flexible stance in the run-up to the Hanoi summit, critics had warned that he risked squandering vital leverage over North Korea if he gave away too much, too quickly.

U.S. intelligence officials have said there is no sign North Korea would ever give up its entire arsenal of nuclear weapons, which Kim’s ruling family sees as vital to its survival.

While the United States has long demanded that North Korea give up all of its nuclear and missile programs, the North wants to see the removal of a U.S. nuclear umbrella for its Asian allies such as South Korea and Japan.

Earlier Kim and Trump, seated across from each other at a conference table, appeared confident of progress, and Kim had suggested he was ready to give up his nuclear bombs.

“If I’m not willing to do that, I won’t be here right now,” Kim told reporters through an interpreter, when asked if he was ready to give up his nuclear weapons.

Trump, responding to that, said: “That might be the best answer you’ve ever heard.”