Cronin, senior director of the Asia-Pacific Security Program at the Center for a New American Security, said he had heard from USA 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.
The U.S. statement said that Sung Kim had led a delegation that met with North Korean counterparts in the village of Panmunjom on Sunday, where they discussed the next steps toward implementing the joint declaration signed by Trump and Kim Jong Un last month.
Last week, a senior defense official said the USA would have data points "pretty soon" that would determine if North Korea was "operating in good faith or not".
Trump tweets Tuesday that "All of Asia is thrilled" that North Korea has halted missile testing and only the "Opposition Party" Democrats, including the "Fake News" is complaining.
The Middlebury Institute of International Studies report found that North Korea has recently expanded a factory complex in the eastern city of Hamhung that produces key engines for solid-fuel ballistic missiles.
On Monday, a White House spokesperson declined to comment to FOX Business regarding the plans for a second meeting.
National security adviser John Bolton, who appeared on CBS' "Face the Nation" Sunday, said he wouldn't comment on US intelligence but emphasized the USA will not be duped by the Kim regime, which has so often acted in bad faith.
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Both meetings discussed the denuclearization of North Korea as a path to peace in the region.
Trump could dangle a second meeting in NY as an incentive for North Korea to follow that timeline, officials told Axios.
Last week, 38 North, a North Korea monitoring project affiliated with Washington's Stimson Center think-tank, said satellite imagery showed the North had been upgrading its Yongbyon nuclear complex.
NY is looming as the next meeting place for Donald Trump and Kim Jong-un.
Following his three-day visit to Pyongyang, which concludes on Saturday, Pompeo will meet with South Korean Foreign Minister Kang Kyung-wha in Tokyo to share details of his meetings with North Korean officials.
The U.S. Defense Intelligence Agency is also reportedly circulating an internal assessment that North Korea does not intend to engage in full denuclearization.
"I don't want a war with North Korea", Graham said.
But two days after National Security Adviser John Bolton gave a one-year timeline for dismantling North Korea's nuclear program, Nauert brushed that aside, saying, "I know some individuals have given timelines".
"I think the Secretary has addressed that extensively, in which he said that North Korea is very clear in terms of our expectations".