After the collapse of the Trump-Kim summit, Pyongyang also slowed the pace of talks with South Korea, which seeks warmer relations with its northern neighbor and a bigger role in reviving U.S.
US national security adviser John Bolton on Saturday called a series of short-range missile tests by North Korea earlier this month a violation of U.N. Security Council resolutions and said sanctions must be kept in place.
North Korea tested short-range ballistic missiles on May 4 and 9, ending a pause in launches that began in late 2017.
With Trump due to arrive in Tokyo for a state visit later on Saturday, he faces deadlock and the possible collapse of what he considers to be one of his key foreign policy achievements, calming tensions with Pyongyang, ending its nuclear and missile tests and starting a dialogue about denuclearization.
On Friday, North Korea's state-run Central News Agency published comments by an unnamed Foreign Ministry official who said that the talks have broke down due to "impossible" U.S. demands.
During his visit, Trump and Japanese Prime Minister Shinzo Abe will "talk about making sure the integrity of the Security Council resolutions are maintained", Bolton said. The North has also strongly protested the recent US seizure of a North Korean cargo ship that had been involved in banned coal exports and demanded the vessel to be immediately returned.
Abe had spoken about the abductees nearly every single time he spoke with Trump on the phone or in person since Trump took office, Bolton said.
The report came about a week after Pyongyang had demanded the United Nations take "urgent measures" to help return a cargo ship seized by the USA for alleged sanctions violations, calling the move a "heinous" act.
Bolton said the ship was taken out of North Korean custody 13 to 14 months ago and that the United States is simply following through with normal civil forfeiture procedures. He added that the U.S.is prepared to resume talks at any point, saying that Special Representative Stephen Biegun is ready "to get on a plane and go anywhere".
U.S. President Donald Trump on Sunday dismissed concerns about recent missile launches from North Korea and said he was confident that the country's leader, Kim Jong Un, would keep promises that he had made.
"It would certainly be in North Korea's interest to hold that meeting", he said.