"It's necessary for North Korea to present far more concrete denuclearization plans, and I think it's necessary for the United States to swiftly reciprocate by coming up with comprehensive measures", Mr. Moon said just days after the summit.
Cronin, senior director of the Asia-Pacific Security Program at the Center for a New American Security, said he had heard from United States and South Korea officials that Pompeo was expected to return to Pyongyang at the end of this week and that Sung Kim was working to prepare the way for that trip.
He said that if progress was made, the US was open to expanded future engagement with North Korea, including a possible visit by Kim to the United Nations General Assembly in NY in September and a second summit with Trump. Evidence collected since the Singapore summit points to preparations to deceive the US about the number of nuclear warheads in North Korea's arsenal as well as the existence of undisclosed facilities used to make fissile material for nuclear bombs, according to the report.
But Kim didn't technically poke Trump's eye. Although Kim has suggested his regime would move away from a singular focus on nuclear weapons development, he's also called for a mass-production pipeline for nukes.
Experts say Pompeo will have to coax significant reciprocal steps from North Korea that would firmly lock the country into a process of disarmament to justify the suspension of the U.S.
"We would be able to dismantle the overwhelming bulk of their programmes within a year", Bolton said.
North Korea watchers also used recent satellite images to conclude that "improvements to the infrastructure at North Korea's Yongbyon Nuclear Scientific Research Center are continuing at a rapid pace".
Missing Thai boys 'found alive' in caves, Thai provincial governor says
Rescuers make their way down at the entrance to the cave complex in Mae Sai, Chiang Rai province, in northern Thailand . Another displays the silhouettes of 12 boys and a man against the stalactites of a cave with the words: "Stay strong".
North Korea continued to expand one of its missile plants during the weeks leading up its summit with the USA last month, according to an analysis of satellite imagery by researchers in the U.S.
"There is no longer a Nuclear Threat from North Korea".
"If they have the strategic decision already made to do that and they're cooperative, we can move very quickly", he said.
Kim made the request during his third meeting with Xi in Beijing last month, and the Chinese president promised to do his "utmost" to satisfy it, the Yomiuri Shimbun newspaper said.
Xi in turn told Kim he "actively supports North Korea's reform and opening-up and will proactively cooperate with issues associated with the efforts", according to the Yomiuri.
The country has since stopped missile and nuclear tests and president Donald Trump has claimed victory in the fight to denuclearise the state.
He added: 'What it suggests is that Kim has no intention of surrendering his nuclear weapons'.
"Now we're saving a lot of money", Trump said of the cancellation of large-scale military drills that involve flights of U.S. bombers from the Pacific U.S. territory of Guam. And it is to North Korea's advantage to dismantle very quickly.