South Korean media speculated that Pompeo could make a third trip to Pyongyang after Kim Yong Chol's USA trip. Trump last week unexpectedly cancelled the planned summit with Kim, citing North Korea's "tremendous anger and open hostility".
Moon, who has lobbied hard for nuclear negotiations between Trump and Kim Jong Un, held a surprise meeting with the North Korean leader on Saturday in an effort to keep the summit alive. In addition, teams of US officials have arrived at the Korean demilitarized zone and in Singapore to prepare for the meeting. The U.S. officials are led by Sung Kim, the U.S. ambassador to the Philippines, who formerly was the U.S. ambassador to Seoul and a top negotiator with North Korea in past nuclear talks.
The Blue House said the attendance of Moon Jae-in will depend on the progress of talks between the USA and North Korean leaders before the summit.
It's a core issue for Kim and a message President Donald Trump shouldn't ignore as they work to nail down their summit next month in Singapore.
The talks come as preparations for the highly anticipated summit in Singapore were barreling forward on both sides of the Pacific Ocean, despite lingering uncertainty about whether it will really occur, and when. It's not known what else he will do in the United States besides meet Pompeo, who has visited North Kore twice recently to discuss a U.S.
They discussed their shared goal of achieving "the complete and permanent dismantlement of North Korea's nuclear, chemical, and biological weapons and ballistic missile programs".
Washington is looking for signs that Kim is ready to accept that talks must lead to him giving up his nuclear arsenal and if the letter is well received it will mark an extraordinary diplomatic turn-around. He will be the highest-level North Korean official to travel to the United States since 2000, when late National Defense Commission First Vice Chairman Jo Myong Rok visited Washington, South Korea's Unification Ministry said.
North Korea's flurry of diplomatic activity following a torrid run in nuclear weapons and missile tests in 2017 suggests that Kim Jong Un is eager for sanctions relief to build his economy and the global legitimacy the summit with Trump would provide.
Kim Yong Chol's official title is a vice chairman of the central committee of the ruling Workers' Party.
Even so, the North's perceived thirst for US economic aid has consistently been the message coming from Trump and his senior officials.
Analysts believe the United States is trying to determine whether North Korea is willing to agree to sufficient steps toward getting rid of its nuclear weapons to allow a summit to take place.
The White House emphasized that it has remained in close contact with South Korean and Japanese officials as preparations for the talks continue.
Since that short-lived crisis, diplomats in both countries have conducted an intense flurry of negotiations, culminating on Thursday when Pompeo sat down in NY with Kim's number two, Kim Yong Chol. Sanders said Trump will host Japanese Prime Minister Shinzo Abe of Japan on June 7th to coordinate their thinking ahead of the summit.
"He also expressed his intention to put an end to the history of war and confrontation through the success of the North-US summit and to cooperate for peace and prosperity", Moon told reporters on Sunday. Trump hosted South Korean President Moon Jae-in last week.
While there have been a few instances in which countries were persuaded to abandon their nuclear ambitions in exchange for sanctions relief and compensation, none of the cases are directly applicable to North Korea, which has advanced its nukes further and with greater zeal than any of the others.