North Korea on Thursday threatened to stall the denuclearization of its missile program if the USA continues to abide by an "outdated acting script" amid Washington's calls to enforce sanctions against the regime.
USA officials, according to North Korea, "are making baseless allegations against us and making desperate attempts at intensifying the global sanctions", against what they believe to be Trump's intentions to better relations between the two countries.
"However, the U.S. responded to our expectation by inciting global sanctions and pressure against North Korea", said a statement.
North Korea's nuclear weapons program has caused worldwide tension for decades and the rhetoric and threats from Kim and Trump had been especially hostile before their June meeting.
The North Korean statement followed comments this week by top American diplomats stressing the need for Pyongyang to take additional steps toward denuclearization.
Earlier this month, U.S. Secretary of State Mike Pompeo warned Russia, China and other countries against any violation of global sanctions on North Korea that could reduce pressure on the North to abandon its nuclear weapons.
On Wednesday, U.S. Ambassador to the United Nations Nikki Haley said the United States was "not willing to wait for too long" for North Korea to take steps toward denuclearising.
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.
Declaring an end to the Korean War is "the demand of our time" and will be the "first process" toward a peace and security guarantee, the Rodong Sinmun, the official newspaper of the Workers' Party of Korea, said in a commentary.
North Korea went ahead with the return of the remains of some US soldiers killed in the 1950-53 Korean war in a goodwill measure aimed at breaking down mistrust between the countries, it said.
South and North Korea technically remain at war as the Korean War ended only with the armistice treaty.
Mr. Kim and Mr. Moon met in April at a highly publicized summit that saw the leaders hold hands and walk together across the border, and then again in a more informal summit in May, just weeks before Mr. Kim met Mr. Trump in Singapore.