In South Korea, Pence will meet Friday morning with North Korean defectors as he pays respects at the Cheonan Memorial in Seoul, which honors the 46 South Korean sailors killed in a 2010 torpedo attack attributed to the North.
It remained unclear whether Kim would be carrying a message from her brother to Moon, who has said he is willing to meet Kim Jong Un if he is reasonably sure that such a meeting would help end the crisis over the North's nuclear weapons.
The participation of North Korea in the Olympics was up in the air, but three rounds of talks also led to the entrance of 22 athletes from North Korea.
She is scheduled to attend the opening ceremony on Friday before joining the lunch meeting. Moon has looked to the games as an opportunity to pursue a diplomatic opening with the North - a move Pence cautioned against.
But hopes for détente have been tempered by deep skepticism over the North's sudden overtures. Kim Yo Jong now holds that position.
Some 140 members of North Korea's Samjiyon Orchestra were giving their first performance at the Gangneung Art Centre since arriving in the South Tuesday.
United Nations diplomats said the approval was expected as council members support the sports détente between North and South Korea.
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A North Korean official says that Pyongyang has no desire to engage in talks with the U.S. on the sidelines of the Winter Olympics, despite South Korean President Moon Jae-in's recent push to promote dialogue between Pyongyang and Washington. A potential escalation of sanctions could be the US blacklisting Chinese banks accused of providing North Korea access to the global financial system and facilitating sanctions evasion.
Pence also left open the possibility of meeting with North Korea's delegation.
With North Korea's decision to send a high-level delegation, the Winter Olympics have suddenly become an arena for high-profile diplomacy.
President Moon Jae-in will receive a group of delegates from the communist north at an undisclosed location this week, his office said.
The concert takes place a day ahead of the Pyeongchang Olympics opening ceremony, where the two Koreas will march together under the blue-and-white Korean unification flag.
"As we speak, an estimated 100,000 North Korean citizens labor in modern-day gulags", Pence said. USA officials have grown increasingly dire in their warnings about the North's march toward developing an operational nuclear-tipped ballistic missile capable of reaching the continental U.S.