"We've been pretty unambiguous in our conversations about what we mean when we say complete denuclearisation", Pompeo told a Senate subcommittee hearing. "They're watching this hearing", he said.
"Mike Pompeo: I don't want to get into the details of intelligence, but I think we have publicly said before that they have a breakup capacity that is in a number of months - 12 months to be precise".
At Thursday's meeting, South Korea was represented by Vice Transport Minister Kim Jeong Ryeol and North Korea by Pak Ho Yong, vice minister for land and environmental protection. "I think his point was a fair one. North Korea has great potential for the future!"More news: Messi and Ronaldo gear up for knockout phase
Pompeo also confirmed North Korea has yet to return the remains of any of the fallen US service members who died in the country during the Korean War, despite the President saying last week that transfers were underway.
Pompeo was also questioned about Trump's saying after the summit with Kim that North Korea no longer posed a nuclear threat, an assertion questioned by analysts and mocked by Democrats.
"North Korea is not obligated to any specific actions as of yet, but (these images) certainly underscore the importance of continuing negotiations, and getting a detailed agreement in place to freeze North Korea's nuclear program", said Jenny Town, managing editor at 38 North, in emailed comments.More news: Travel ruling could boost other immigration suits
China has been a critical player in that effort, and remains so, according to Pompeo.
U.S. Secretary of State Mike Pompeo, then serving as director of the Central Intelligence Agency, reportedly pushed for Harris' placement in Korea.
Trump has often pointed to the absence of North Korean missile and nuclear tests in recent months as a sign of progress toward denuclearization, but continued maintenance of facilities like Yongbyon show that talks with the U.S. have not yet prompted Kim to take significant steps toward truly dismantling the foundation of his program.More news: Late Saudi strike settles send-off with Egypt
He added that Washington D.C. will not put a timeline on negotiations with North Korea, but will instead constantly reassess latter's commitment to denuclearisation.