She said Pyongyang now has no intention of compromising or continuing talks unless the United States takes measures that are commensurate to the changes it has taken - such as the 15-month moratorium on launches and tests - and changes its "political calculation".
"I want to make it clear that the gangster-like stand of the USA will eventually put the situation in danger", AP quoted her as saying.
While both said that categorization was "inaccurate" or "wrong", there has been little contact between the two sides since the Hanoi summit ended without a deal, and each country said their offer would not change.
North Korea is considering suspending talks with the United States and may rethink a ban on missile and nuclear tests unless Washington makes concessions, news reports from the North's capital on Friday quoted a senior diplomat as saying.
Choe's remarks, in which she described the U.S. stand as "gangster-like", seem to point to a change in North Korea's strategy following the talks, with both Pyongyang and Washington initially voicing a readiness to continue on with negotiations.
"We've discussed their reaction and our reaction", Bolton said. Following the meeting, Trump said the North had demanded full sanctions relief in return for dismantling a limited portion of its nuclear weapons program.
North Korea's leader Kim Jong Un and President Donald Trump meet along with Secretary of State Mike Pompeo, White House national security adviser John Bolton, right, during the second North Korea-U.S. summit in Hanoi, Vietnam, Feb. 28, 2019.
South Korean officials are reportedly monitoring the situation. "It's the administration's desire that we continue to have conversations about this". Instead she blamed Mike Pompeo and National Security Adviser John Bolton for hardening the U.S. position. "I have every expectation that we'll be able to continue to do that".
Pyongyang announced that Kim Jong-un will shortly decide whether he intends to continue his moratorium on missile and nuclear tests after the failure of the Hanoi summit to make progress toward resolving the standoff on the Korean peninsula.
"At this time, they (North Korea) are willing to reform and become more open, which requires sanctions being lifted, but they also need to show their willingness to denuclearize and are urging the USA president to take action", he said. US officials explained that decommissioning Yongbyon would not do enough to irreversibly end North Korea's nuclear missile program, while the concessions North Korea demanded would effectively unravel the sanctions regime.
Choe, who attended the Hanoi summit, said Kim was puzzled by what she called the "eccentric" negotiation position of the United States, but she said the North Korean leader still had a good relationship with Trump.
A senior official said Trump "is not prepared to reward North Korea in exchange for talks". 'I'm not sure why the US came out with this different description.
Miller also characterized the developments at Sohae as a way for North Korea to place additional pressure on Washington leading up to the summit to signal that the talks are a "fragile process", but that approach didn't yield the results Pyongyang had hoped for.
USA envoy Stephen Biegun has also ruled out doing denuclearization "incrementally", although he insisted on Monday that diplomacy was "still very much alive".