A top North Korean general is headed for the United States in what would be the highest-profile visit in years, reports said on Tuesday as the two countries prepare for a momentous summit.
Diplomacy accelerated on Tuesday ahead of a potential summit between US President Donald Trump and North Korean leader Kim Jong-un as a team of American diplomats involved in preparatory discussions left a Seoul hotel, possibly to continue talks with their North Korean counterparts.
Meanwhile, in Beijing, South Korea's Yonhap news agency reported that senior North Korean official Kim Yong-chol planned to head to the United States, potentially for more talks to set up the summit over the future of North Korea's nuclear weapons programme.
He would be the most senior North Korean official to visit the United States in 18 years.
It's possible the trip could be a reciprocal visit after US Secretary of State Mike Pompeo traveled to Pyongyang, North Korea's capital, twice in recent weeks for meetings with Kim Jong-un, after which he said there was a "shared understanding" between the two sides about what they hope to achieve in the summit. It remains unclear whom Kim Yong-chol would meet in the United States if he goes.
South Korean media also reported that a North Korean delegation arrived in Singapore on Monday night for likely summit preparations with US officials.
Seoul did not confirm reports that the North Korean officials were headed by Kim Chang-son, Kim Jong-un's close associate, and that his American counterpart would likely be White House deputy chief of staff for operations Joe Hagin.
South Korea's Foreign Ministry said Washington and Pyongyang were engaging in "working-level" talks to arrange the possible summit, but said it couldn't confirm specifics.
Ministry spokesman Noh Kyu-duk also did not say whether Seoul knew of any US plans regarding Kim Yong-chol's possible visit, such as whether he and Pompeo have plans to meet.
Yonhap said Kim Yong-chol's name was on the passenger list for a flight on Wednesday from Beijing to New York. It earlier reported that he was heading straight to Washington, but later said he changed his flight to New York.
South Korean officials couldn't immediately confirm the report. Kim was seen in the Beijing airport on Tuesday by Associated Press Television.
Melinda Nucifora has more for TRT World.
Kim is a former military intelligence chief and now a vice chairman of the North Korean ruling party's central committee tasked with inter-Korean relations.
A visit to the United States would be the highest-level North Korean official visit since 2000, when late National Defense Commission First Vice Chairman Jo Myong-rok visited Washington, South Korea's Unification Ministry said.
In South Korea, it wasn't immediately clear whether the American officials, including Sung Kim, the US ambassador to Manila, were heading to the Korean village of Panmunjom, which straddles the border inside the demilitarised zone, where they met North Korean officials on Sunday.
Sung Kim is a former US ambassador to South Korea and was a top negotiator with North Korea in past nuclear talks.
Trump withdrew from a planned June 12 summit with Kim Jong-un last Thursday, citing hostile North Korean comments, but has since said the meeting in Singapore could still happen.
South Korean President Moon Jae-in, who has lobbied hard for nuclear negotiations between Trump and Kim, met with the North Korean leader in a surprise meeting on Saturday in an effort to keep the summit alive.
In their second meeting in a month, Moon said Kim expressed willingness to co-operate to end confrontation and work toward peace for the sake of a successful summit with Trump.
But Kim also said he was unsure whether he could trust the United States over its promise to end hostile policies against North Korea and provide security assurances if the country does abandon its nuclear weapons, according to Moon.
At their first meeting on April 27, Kim and Moon announced vague aspirations for a nuclear-free Korean Peninsula and permanent peace, which Seoul has tried to sell as a meaningful breakthrough that increases the chances of successful talks between Kim and Trump.
Their second meeting came after inter-Korean relations had chilled in recent weeks, with North Korea canceling a high-level meeting with Seoul over South Korea's participation in a two-week military exercise with the United States that ended last week.
The Koreas have agreed to put high-level discussions back on track with a meeting on Friday.
But that did not stop North Korea's state media from continuing its criticism of allied military exercises on Tuesday, saying if Washington "sincerely hopes for the talks, it should stop the acts of threatening its dialogue partner by force."
Since the 1970s, the United States and South Korea have been holding a major summertime exercise called Ulchi Freedom Guardian that involves tens of thousands of troops. South Korea's Defense Ministry said on Tuesday there have been no discussions yet between Washington and Seoul on modifying the drills, which usually take place in August.
Despite Kim's apparent eagerness for a summit with Trump, there are lingering doubts about whether he will fully relinquish his nuclear weapons, which he may see as his only guarantee of survival. Moon has insisted Kim can be persuaded to abandon his nuclear facilities, materials and bombs in a verifiable and irreversible way in exchange for credible security and economic guarantees.
US and South Korean officials haven't confirmed the details of the pre-summit negotiations between Washington and Pyongyang at the border.
The officials may discuss bridging the gap between the two sides on what a deal on the North's nuclear weapons would look like. There's also speculation that American officials are trying to persuade the North Koreans to export a certain number of their nuclear warheads overseas at an early stage as proof of their commitment to denuclearise.
US officials have talked about a comprehensive one-shot deal in which North Korea eliminates its nukes first and receives rewards later.
But Kim, through two summits with Chinese President Xi Jinping in March and May, has called for a phased and synchronised process in which every action he takes is met with a reciprocal reward from the United States.
Seoul has been advocating an alternative approach in which the North's comprehensive commitment and credible actions toward denuclearisation are followed by a phased but compressed process of inspection and verifiable dismantling.
Before he cancelled the summit, Trump did not rule out an incremental approach that would provide incentives along the way to the North.