Vice Foreign Minister Choe Son Hui said the United States missed a golden opportunity in Hanoi, and warned that Kim may rethink his moratorium on missile launches, the Associated Press reported.
She blamed the USA for the stalemate at the Trump-Kim summit in February, saying Secretary of State Mike Pompeo and National Security Adviser John Bolton "created the atmosphere of hostility and mistrust", TASS reports.
"President Trump has said for some time that he was open to talks and he would willingly meet with Kim when conditions were right".
Trump told reporters on Wednesday that he had "no update" on North Korea, but said he seemed to "have a very good relationship" with the country's officials.
Trump has pointed to North Korea's freeze in nuclear and missile testing since 2017 as a positive outcome from almost a year of diplomatic engagement with North Korea.
The U.S. line appears to have hardened since then, NPR's Anthony Kuhn reports from Seoul, South Korea.
The North Korean diplomat mixed these condemnations of Trump's top advisers with praise for the president himself, insisting the "chemistry" between Trump and Kim remains "mysteriously wonderful".
The meeting in Vietnam ended when Trump walked away from North Korea's offer to dismantle the Yongbyon nuclear facility in exchange for relief from economic sanctions targeting their industries like coal, oil, and fishing and totaling billions of dollars.
British MPs vote in favor of ruling out a ‘no-deal’ Brexit
Leaving the European Union without an agreement, some experts worry, could lead to food shortages and trade-related chaos. He told BBC Radio 4′s Today programme: "Between those very unpleasant choices, I think no Brexit is the bigger risk".
"It's the administration's desire that we continue to have conversations around this", Pompeo said.
"Just in the past hour, I spoke with my South Korean counterpart and we've discussed their reaction and our reaction, but I would like to speak further within United States government before we respond", Bolton told reporters on the White House North Lawn Friday.
"What we'll need to see is action, and that's what we're counting on, and it's what I'm hopeful we'll get in the months ahead", he said.
"Kim Jong Un could announce his position on nuclear negotiations with the USA and possibly even how he intends to follow up on his comment in his New Year's speech about "seeking a new path" if the United States continues to exert pressure", said Minyoung Lee, an analyst at NK Pro. Hanoi was supposed to be the part of the same old story where the USA accepted a meager offer from North Korea and declared diplomatic victory, only to watch the North Koreans take back everything they "gave away" a few months later and demand fresh concessions to refrain from further provocations.
North Korea says Pyongyang has no intention of giving in to Washington's demands and Kim Jong Un would be making a statement soon on the possibility of further talks.
The US says sanctions will remain until Pyongyang destroys all nuclear sites. "I have every expectation we will be able to continue to do that". "That's Chairman Kim's word".
Joel Wit of the 38 North think tank said North Korea was likely toughening its negotiating position after the collapse of the Hanoi summit.
It was not immediately clear if the veteran diplomat was just trying to put pressure on Washington or whether North Korea is seriously considering abandoning denuclearization talks.
'What is clear is that the US has thrown away a golden opportunity this time, ' she said. North Korea expert Joshua Pollack said North Korea may be delivering an ultimatum.