A summit between US President Donald Trump and the North Korean leader Kim Jong-un ended with no agreement after the US refused North Korean demands for an end to all sanctions.
“It was all about the sanctions,” Mr Trump told reporters. “They wanted the sanctions lifted in their entirety and we couldn’t do that.”
The pair had been expected to announce progress on denuclearisation during their second meeting in less than one year.
“Sometimes you have to walk and this was one of those times,” Mr Trump said.
Speaking at a news conference after the summit in the Vietnamese capital of Hanoi, Mr Trump said no plans had been made for a third summit.
The original White House programme for the day had planned for a “Joint Agreement Signing Ceremony” as well as a working lunch for the two leaders, but expectations were abruptly dashed with the cancellation of both.
South Korea called the breakdown of talks “regrettable” but said it believed the US and North Korean leaders had made “more meaningful progress than at any time prior”.