"Each of those three countries has also acknowledged that it's important that the sanctions regime that is in place today remain in place until such time as that denuclearization is, in fact, complete", Pompeo told reporters Thursday in Beijing following talks with Chinese counterpart Wang Yi. The five-hour summit did give Trump and Kim a chance to express optimism and make of show of their new relationship.
A spokeswoman for USA military forces in Korea said it had not received any direction to cease joint military drills.
"I think he's going to do these things", Trump said.
At his news conference, President Trump said it was hard to ensure anything but that he trusted his instinct that Mr Kim would abide by his word. And so do the North Koreans.
Reportedly, neither Seoul nor US Forces Korea had been informed in advance of the cancellation of the drills - a long-standing North Korean demand.
After returning to the White House Wednesday, Trump also defended his decision to halt the joint military exercises with South Korea, which he called "war games" - a term used by Pyongyang - arguing on Twitter that the USA will "save a fortune". There is no longer a Nuclear Threat from North Korea. Ultimately, in the short term, at least while diplomacy continues, Trump's tweets seem to indicate he is ready to live with the fact that North Korea has nuclear weapons and potentially the capacity to fire them at the United States, in an implicit erosion of the USA strategic position. North Korea has great potential for the future!' But about 30 percent said they approved of his handling of North Korea.
The declaration took some South Korean and US military officials by surprise - though US Defence secretary Jim Mattis was not among them, with spokeswoman Dana White saying "there were no surprises".
Despite Pompeo's insistence that sanctions would hold until denuclearization occurred, he offered few details on how the complex process of complete, verifiable and irreversible denuclearization would be implemented. "President Trump made that clear", Pompeo said. Photos of Kim standing side-by-side with Trump on the world stage were splashed across newspapers.
Joel Wit, a Stimson Center senior fellow and North Korea expert, told NPR that in such a timeline "you could probably disarm key portions of the North Korea nuclear program".
Most Western observers have said the deal includes no new commitments from North Korea nor details on how denuclearisation could be achieved or verified. Past year it tested long-range missiles that could reach the US mainland, although it remains unclear if it has mastered the technology to deliver a nuclear warhead that could re-enter the atmosphere and hit its target.
Pompeo also said he anticipates the United States would next speak to North Korean officials "fairly quickly after we return to our home countries", adding that he was "very confident" that some form of engagement between the two sides would take place in the next week.
Japan has reacted to Trump's plan to cancel military exercises with South Korea with concern, saying the drills were vital for east Asian security. They walked outside together after the lunch, stopping briefly to look at the US president's special limousine. The next scheduled major exercise, involving tens of thousands of troops, normally is held in August.
"We are prepared to start a new history, and we are prepared to write a new chapter between our nations", Trump said. He said he planned to continue sharing the view with Washington and Seoul.