Across Asia, administration officials have been dispatched to carry out Trump's directive.
The delegation met with North Korea's vice foreign minister Choe Son Hui, who sparked Trump's ire last week when she called Vice President Mike Pence a "political dummy". The officials are meeting through Tuesday attempting to get the June 12 summit in Singapore back in motion.
Australian man Howard turns heads dressed as Kim Jong-un in Singapore.
USA and North Korean officials are set to meet in Singapore on Tuesday to discuss security and protocol issues concerning a possible summit between their leaders, a diplomatic source here said.
Moon later announced that Kim had reaffirmed his commitment to denuclearization and willingness to meet with Trump.
A team of American diplomats involved in preparatory discussions ahead of a potential summit between President Donald Trump and North Korean leader Kim Jong Un have left a hotel in Seoul amid speculation that they are resuming the talks.
The American president said the summit could go ahead as planned following a more appeasing statement from Pyongyang and productive talks with North Korean officials.
One of Kim Jong-un's most senior officials is thought to be travelling to the U.S., as preparations for a possible historic summit gather pace.
Judge orders 30-year-old man to move out of parents' house
Greenwood also asked the state's adult protective services agency to investigate the case further, reported Syracuse.com. He told reporters outside the court that it sounded like the judge was ordering him to move out without enough notice.
According to Reuters, the impersonator had been in town to wish success for the summit, held to negotiate an end to North Korea's nuclear programme.
It has long said it is open to eventually giving up its nuclear arsenal if the USA withdraws its troops from South Korea and ends its "nuclear umbrella" alliance with Seoul.
Kim Yong Chol, vice chairman of North Korea's ruling Workers' Party Central Committee, watches the closing ceremony.
A top North Korean general is headed for the United States in what would be the highest-profile visit in years, reports said Tuesday as the two countries prepare for a momentous summit.
But as the clock ticks toward June 12, Trump's aides are describing a renewed sense of urgency to make progress that would allow the two leaders to meet on schedule.
Mr. Moon said he told Mr. Kim in return that Mr. Trump has a "firm resolve" to end hostile relations with North Korea and initiate economic cooperation if Pyongyang implements "complete denuclearization".
"If the summit is going to happen, I'm going to guarantee it won't just be me".
The details of such a plan, however, remain in question. "I'd like to say that the fact that North Korea and the USA agreed to have a summit and working-level talks indicates that the US has already confirmed the North's intentions". A similar, painstaking process yielded the Iran nuclear deal which Trump derided and withdrew from last month. "That hasn't changed. And it's moving along pretty well, so we'll see what happens", he said. "They shared the opinion that they would meet frequently in the future to make dialogue brisk and pool wisdom and efforts", KCNA said.
A "pre-advance" team of USA officials has also traveled to Singapore to meet with North Koreans there, the White House said.