North Korea has branded the US attitude at the latest talks over its nuclear programme “regrettable” and “extremely troubling”.
The statement, by an unnamed foreign ministry official, contradicted the version of events given by US Secretary of State Mike Pompeo just hours before.
He had said progress was made during his two-day visit to Pyongyang.
It was the first time he had visited North Korea since the Donald Trump-Kim Jong-un summit in Singapore.
The North Korean statement, carried by the official KCNA news agency, said the US had gone against the spirit of the summit by putting unilateral pressure on the country to abandon its nuclear weapons.
“We had anticipated the US side would come with a constructive idea, thinking we would take something in return,” the North Korean statement said.
“But through the high-level talks, the trust between the DPRK and the United States is facing a dangerous situation where our resolve for denuclearisation, which has been firm and steadfast, may falter.”
‘Great deal of progress’
A key aim of Mr Pompeo’s two days of talks was to firm up North Korea’s commitment to denuclearisation.
He had met Kim Yong-chol, widely seen as North Korean leader Kim Jong-un’s right-hand man.