Ivanka Trump has had no interaction with North Korean officials during her visit to South Korea, a White House official said Sunday amid keen interest in whether the two sides will resume dialogue.
Earlier, about 100 conservative South Korean lawmakers and activists staged a sit-in near the border with North Korea, to protest Kim's arrival and facing off against about 2,500 South Korean police.
The group ended a three-day visit to the South in which it repeatedly expressed its willingness to talk with the United States, reports Efe news.
General Kim Yong-chol, who is in charge of inter-Korean affairs for the ruling Workers' Party, made a rare trip to the South to attend Sunday's closing ceremony of the Winter Olympics. The administration's position is that North Korea must make a clear commitment to eliminating its nuclear and missile programs before any talks can take place.
Trump has vowed to use force if necessary to prevent North Korea from acquiring a nuclear-tipped missile that could strike the USA mainland.
According to his office, Moon asked for China's support for U.S.
The White House said its sanctions would continue.
During last month's inter-Korean talks, North Korea said it would send a 150-member delegation including officials, athletes, artists and cheerleaders to the Paralympics.More news: Rob Gronkowski posts a cryptic tweet about his National Football League future
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North Korea is developing nuclear-tipped missiles capable of reaching the US mainland and US President Donald Trump and North Korean leader Kim Jong Un exchanged increasingly bellicose taunts before a sudden puncturing of tensions coinciding with the Games, with the North sending athletes and delegates.
Kim Yo Jong and the North's nominal head of state were the most senior North Korean officials to visit the South in more than a decade.
Moon has been working tirelessly to steer the United States and North Korea away from what he considered a collision course, urging them to open talks.
Sanders is traveling with the USA delegation, and made the comments after the United States announced further sanctions against North Korea late Friday.
Later on Sunday the White House said in a statement that "denuclearization must be the result of any dialogue with North Korea".
She met Moon on Friday as part of a weekend trip leading the USA delegation to the closing ceremony.
Kim Yong Chol was accused by the South of being behind the sinking of a South Korean warship in 2010 that killed 46 sailors and has been the subject of protests since his visit was announced.
But experts say arranging an inter-Korean summit would be hard after a year in which North Korea conducted its most powerful nuclear test and flight-tested intercontinental ballistic missiles that could, when perfected, target the US mainland.