North Korea has accused the US of using "gangster-like" tactics to push it towards nuclear disarmament after a fresh round of high-level talks.
It branded the US attitude at the meeting as "extremely troubling".
The statement, by an unnamed foreign ministry official, gave a starkly different account from one provided by US Secretary of State Mike Pompeo. He had said progress was made during his two-day visit to Pyongyang.
It is the first time he has visited North Korea since a summit between Donald Trump and Kim Jong-un in Singapore. A key aim of Mr Pompeo during his visit was to firm up North Korea's commitment to disarmament.
But 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.
At the talks, Mr Pompeo did not meet with Mr Kim, but instead with Kim Yong-chol, who is seen as his right-hand man.
After the Singapore summit, which also saw the US offer "security guarantees" to North Korea and promise to end its military drills with South Korea, Mr Trump claimed that the North no longer posed a nuclear threat.
However, the president has since renewed sanctions on North Korea, while US intelligence officials have said there is evidence North Korea continues to upgrade the infrastructure for its nuclear and missile programmes.