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. "If not for me", he tweeted, "we would now be at War [sic] with North Korea!". "Only the Opposition Party, which includes the Fake News, is complaining". The Financial Times reported that Pompeo was due to visit North Korea this week but Reuters has not been able to confirm his travel plans.
He said Secretary of State Mike Pompeo will likely discuss that proposal with the North Koreans soon.
But new satellite imagery shows an expansion of a missile-manufacturing site capable of producing missiles that could hit USA military installations in Asia.
Several reports released in recent days suggest that Kim continued to ramp up his weapons production - rather than prepare to disarm - in the weeks leading up to his June 12 summit with Trump in Singapore.
"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.
She endorsed comments on Sunday by US National Security Adviser John Bolton who said he believed the bulk of North Korea's weapons programmes could be dismantled within a year "if they have the strategic decision already made to do that".
Pompeo last visited Pyongyang in May ahead of the Trump-Kim summit and traveled there secretly in early April while he was director of the Central Intelligence Agency.
With the USA team meeting North Koreans at the DMZ Sunday, it seems those talks have - but so far, all signs indicate that the regime is not taking meaningful steps to hold up its end of the agreement.
In this Thursday, May 24, 2018 photo, smoke and debris rise in the air as barracks buildings for guards and tunneling workers at North Korea's nuclear test site are blown up at Punggye-ri, North Hamgyong Province, North Korea.
The visit represents the highest-level exchange between the two sides since Mr Trump and Kim met in Singapore and agreed to work toward "complete denuclearisation of the Korean Peninsula", without establishing a framework or guideposts for achieving that goal. Over the weekend, a USA envoy met with the North Koreans at the DMZ.
The North Koreans should know what to expect in these meetings, Nauert added: "We've had very clear conversations with them".
USA intelligence is not certain how many nuclear warheads North Korea has.
As the USA seeks "verifiable commitments" from North Korea that it is getting rid of nuclear weapons, Enos said, "the US should continue to proceed with caution, recognizing who it is dealing with: a brutal dictator with a awful track record of human rights abuses and an equally bad track record in keeping his word".