The Australian-Chinese man posing as the North Korean leader calls himself only Howard X and said he was appearing to wish success for a summit between Kim and U.S. President Donald Trump to negotiate an end to the North's nuclear programme.
"I just want to mention we're doing very well in terms of the summit with North Korea".
Moon and Kim held a surprise summit in the Demilitarized Zone separating their two nations on Saturday in a scramble to save a slated June 12 summit between North Korea and the United States in the city-state of Singapore.
On Sunday US negotiators, headed by Washington's ambassador to the Philippines Sung Kim, began meeting North Korean counterparts in the truce village of Panmunjom that divides the two Koreas.
"Solid response to my letter, thank you!" tweeted Trump.
"When the senior leaders are basically saying move forward, and that's their message to their working groups, I think there's a good chance" the meeting happens, said John Park, director of the Korea Working Group at Harvard's Kennedy School, who added the most plausible outcome from the talks would be an agreed-upon plan for North Korea to address its nuclear program.
Kim, the USA ambassador to the Philippines, also served as ambassador to South Korea and was part of the US negotiating team that last held substantive denuclearization talks with North Korea during the George W. Bush administration in 2005.
"We're looking at June 12 in Singapore". They allowed Moon to push for a U.S. The North's arsenal now includes purported thermonuclear warheads and developmental long-range missiles potentially capable of reaching mainland US cities.
He pledged utmost efforts to solve various problems by cooperating with the United States, South Korea, Russia, China and the rest of the global community.
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"Sending such an experienced and professional team signals that the Trump administration is getting serious about the specifics of an agreement", said Abraham Denmark, a former USA deputy assistant secretary of defence for East Asia.
But the North Korean leader also said he was unsure whether he could trust the United States to end hostile policies against his country and provide security assurances if the country does abandon its nuclear weapons, according to South Korean President Moon Jae-in.
Prime Minister Abe has expressed firm support for the USA throughout the ups and downs of the summit-planning process, confirming last Friday that he supported Trump's surprise decision to withdraw the June 12 summit.
They agreed to have their top officials meet again on June 1.
At their first meeting on April 27, Kim and Moon first announced "complete denuclearization of the Korean Peninsula" and permanent peace, which Seoul has tried to sell as a meaningful breakthrough to set up the summit with Trump.
"It's also an implicit acknowledgment that running this negotiation out of the Oval Office has not worked, and that lower-level officials are needed to work out the details before a summit can take place".
Moon was accompanied by his spy chief, Suh Hoon, while Kim was joined by Kim Yong Chol, a former military intelligence chief who is now a vice chairman of the North Korean ruling party's Central Committee tasked with inter-Korean relations. South Korea's Yonhap news agency cited diplomatic sources as saying that Kim was on an Air China flight to NY that departed later Wednesday afternoon.
But it wasn't immediately known what else he would do in the United States.