UPDATE | I don't think NK's Kim had role in Ohio student's death

HANOI, Vietnam (AP) — President Donald Trump says he doesn't think North Korean leader Kim Jong Un was involved in the mistreatment of American college student Otto Warmbier (WARM'-beer), who died after being detained in the isolated country.

Trump says of Kim: "He tells me that he didn't know about it, and I will take him at his word."

Trump has taken credit for freeing American prisoners abroad and used Warmbier's death as a rallying cry against the North's human rights abuses before softening his rhetoric before talks with Kim.

Warmbier, a University of Virginia student from Ohio, was sentenced to 15 years of hard labor in 2016 on suspicion of stealing a propaganda poster. He died in June 2017, shortly after being sent home in a coma.

His parents say he was tortured.

Meanwhile, talks between President Donald Trump and North Korea’s Kim Jong Un collapsed Thursday after the two sides failed to bridge a standoff over U.S. sanctions on the reclusive nation, a dispiriting end to high-stakes meetings meant to disarm a global threat.

Trump blamed the breakdown on North Korea’s insistence that all the punishing sanctions the U.S. has imposed on Pyongyang be lifted without the North committing to eliminate its nuclear arsenal.

“Sometimes you have to walk,” Trump explained at a closing news conference after the summit was abruptly cut short. He said there had been a proposed agreement that was “ready to be signed.”

“I’d much rather do it right than do it fast,” Trump said. “We’re in position to do something very special.”

Mere hours after both nations had seemed hopeful of a deal, the two leaders’ motorcades roared away from the downtown Hanoi summit site within minutes of each other, their lunch canceled and a signing ceremony scuttled. The president’s closing news conference was hurriedly moved up, and he departed for Washington more than two hours ahead of schedule.

The disintegration of talks came after Trump and Kim had appeared to be ready to inch toward normalizing relations between their still technically warring nations and as the American leader dampened expectations that their negotiations would yield an agreement by North Korea to take concrete steps toward ending a nuclear program that Pyongyang likely sees as its strongest security guarantee.

In something of a role reversal, Trump had deliberately ratcheted down some of the pressure on Pyongyang, abandoning his fiery rhetoric and declaring that he wanted the “right deal” over a rushed agreement. For his part, Kim, when asked whether he was ready to denuclearize, had said, “If I’m not willing to do that I won’t be here right now.”

The breakdown denied Trump a much-needed triumph amid growing domestic turmoil back home, including congressional testimony this week by his former personal lawyer Michael Cohen, who called Trump a “racist” and “conman” and claimed prior knowledge of foreign powers’ efforts to help Trump win in 2016.

North Korea’s state media made no immediate comment on the diplomatic impasse, and Kim remained in his locked-down hotel after leaving the summit venue. The North Korean leader was scheduled to meet with top Vietnamese leaders on Friday and leave Saturday on his armored train for the long return trip, through China, to North Korea.

Trump insisted his relations with Kim remained warm, but he did not commit to having a third summit with the North Korean leader, saying a possible next meeting “may not be for a long time.” Though both he and Secretary of State Mike Pompeo said significant progress had been made in Hanoi, the two sides appeared to be galaxies apart on an agreement that would live up to the U.S.′ stated goals.

“Basically, they wanted the sanctions lifted in their entirety, and we couldn’t do that,” Trump told reporters.

Kim, he explained, appeared willing to close his country’s main nuclear facility, the Yongbyon Nuclear Scientific Research Center, if the sanctions were lifted. But that would leave him with missiles, warheads and weapon systems, Pompeo said. There are also suspected hidden nuclear fuel production sites around the country.

“We couldn’t quite get there today,” Pompeo said, minimizing what seemed to be a chasm between the two sides.

Longstanding U.S. policy has insisted that U.S. sanctions on North Korea would not be lifted until that country committed to, if not concluded, complete, verifiable and irreversible denuclearization. Trump declined to restate that goal Thursday, insisting he wanted flexibility in talks with Kim.

“I don’t want to put myself in that position from the standpoint of negotiation,” he said.