It also claims that "high-level officials within the USA administration are making baseline allegations against [North Korea] and making desperate attempts at intensifying the worldwide sanctions and pressure".
North Korea appears to continue dismantling a rocket launching site, a USA think tank said, based on satellite images. "We continue to have conversations with the government", she added.
White House national security adviser John Bolton on Tuesday said North Korea has not taken the necessary steps to denuclearize despite an agreement between Pyongyang's leader Kim Jong Un and U.S. President Donald Trump in June.
"As long as the U.S. denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the DPRK-U.S. joint statement including the denuclearization", it said. "The worldwide society is struck by this shameless and impertinent behavior of the USA, and we also closely follow the USA behavior with high vigilance against their intentions".
"As long as the United States denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the joint statement including the denuclearisation", North Korea's foreign ministry said on Thursday.
North Korea has condemned the U.S. for placing fresh sanctions on it and called on the country to respond to its efforts to improve bilateral ties.
"They have to understand that the global community still expects them to denuclearize and so we're willing to wait if they want to wait, but we're not willing to wait for too long", said Haley, who has pushed through three United Nations sanctions packages since arriving at the world body 18 months ago.
Ben Tracy and Pam Falk contributed reporting.
Kim vowed in Singapore to work toward denuclearization, but the two sides have yet to define a deal to meet that goal and Washington insists sanctions pressure must be maintained during negotiations.
North Korea called out the U.S.' "shameless and impertinent behavior", according to a press release out Thursday via a foreign ministry spokesperson.
Asked about the possibility of additional meetings, Bolton said Trump in a recent letter to Kim proposed sending Pompeo back to North Korea, and that Trump was ready to meet with Kim any time.
The United States was "attempting to invent a pretext for increased sanctions against the DPRK by mobilising all their servile mouthpieces and intelligence institutions to fabricate all kinds of falsehoods". Washington is pushing for the North to begin giving up its nuclear program.
"North Korea's strategic policy is to deepen relations with the Islamic Republic of Iran and confront unilateralism", he said.