North Korea on Thursday accused the United States of acting in bad faith, saying Washington's push for full sanctions pressure against Pyongyang would stall progress on the denuclearisation of the Korean Peninsula.
But the North Korea statement separates Mr. Trump from "high-level officials", thus allowing the the country to rail against the USA, while leaving the door open for the president to continue his dialogue with leader Kim Jong Un.
In an April summit, President Moon Jae-in and North Korean leader Kim Jong-un agreed to seek such declaration this year through three-way meetings involving the two Koreas and the United States or four-way talks involving the two Koreas, the U.S. and China.
At Trump and Kim's historic summit, the two signed a document stating that Pyongyang would work toward "complete denuclearization of the Korean Peninsula".
"It's just North Korea that has not taken the steps we feel are necessary to denuclearize", Bolton said. Among the agreements was holding another inter-Korean summit in the fall in Pyongyang.
The North noted that they returned remains of USA soldiers who fought in the Korean War to the US last week.
The White House and State Department did not immediately return requests for comment.
North Korea appears to continue dismantling a rocket launching site, a US think tank said, based on satellite images.
It continued: "Now, the issue in question is that going against the intention of President Trump to advance the DPRK - US relations, some high level officials within the US administration are making baseless allegations against us and making desperate attempts at intensifying the worldwide sanctions and pressure".
"As long as the US denies even the basic decorum for its dialogue partner and clings to the outdated acting script which the previous administrations have all tried and failed, one can not expect any progress in the implementation of the DPRK-US joint statement, including the denuclearisation", it said.
North Korea called out the U.S.' "shameless and impertinent behavior", according to a press release out Thursday via a foreign ministry spokesperson.
"This is all in North Korea's court", Haley told reporters traveling with her during a visit to Colombia.
But the details of that process remain vague - North Korea did not commit to unilaterally give up its nuclear weapons and the United Nations says its nuclear programme is continuing.