Kim Yo Jong would be the first member of North Korea's ruling family to visit the South since the 1950-53 Korean War, which ended in an armistice rather than a peace treaty — meaning the countries officially remain at war. The North Korean delegation will also include the country's nominal head of state, Kim Yong Nam.
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Vice President Mike Pence, who arrived in South Korea on Thursday ahead of the Olympics, is also set to meet separately with Moon. Pence is pushing South Korea to adopt a more hawkish stance toward Kim's regime and warning against North Korean "propaganda" efforts at the games.
At the same time, the vice president has deliberately left the door open to a possible encounter with North Korean officials expected to be in attendance.
North Korean state media said Friday its officials have no intention of meeting with Pence.
A day before the opening ceremony of the games, tens of thousands of North Korean soldiers marched Thursday in Kim Il Sung Square in Pyongyang along with trucks mounted with rocket launchers to mark the 70th anniversary of the founding of its military. North Korean state TV showed Kim Jong Un attending the rally.