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.
Three South Korean firms imported coal from North Korea disguised as Russian products in violation of United Nations resolutions in a fresh sign of loosening sanctions, South Korea's customs agency said on Friday.
Since the June meeting, Pyongyang has announced measures including halting missile and nuclear tests.
"However, the United States responded to our expectation by inciting global sanctions and pressure against the DPRK", it said in a statement carried by KCNA news agency.
The White House and State Department did not immediately return requests for comment.
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.
The unidentified spokesperson also warned that there is no guarantee that the hard-won atmosphere of stability on the Korean Peninsula will continue.
North Korea's foreign ministry said on Thursday it had stopped testing missiles, conducted nuclear tests and dismantled "the nuclear test ground", yet the United States still insisted on "denuclearization first".
"They made public the North Korea Sanctions and Enforcement Actions Advisory; and additional sanctions".
North Korea slammed the United States for lacking "basic decorum" in nuke talks.
The warnings come just days after North Korea's foreign minister called United States actions "alarming". It also wasn't clear when another leaders' summit might happen.
Pyongyang's state media has highlighted it has made goodwill gestures, such as a moratorium on nuclear and missile tests, the dismantling of a nuclear site, and the return of the remains of US soldiers killed in the 1950-53 Korean War. South Korea's unification minister will lead the delegation from Seoul but North Korea, which proposed the Monday meeting first, did not confirm the makeup of its delegation. The Korean Peninsula is still technically in a state of war because the fighting ended with a cease-fire, not a peace treaty.
Trump's national security adviser, John Bolton, also said this week that North Korea has not taken the steps necessary to denuclearise.
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.
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