Kim Yo Jong, second from right, sister of North Korean leader Kim Jong Un, sits alongside Kim Yong Nam, president of the Presidium of North Korean Parliament, at the opening ceremony of the PyeongChang 2018 Winter Olympic Games.
Torchbearers North Korean Jong Su Hyon and South Korean Park Jong-ah hold the Olympic Flame during the opening ceremony of the 2018 Winter Olympic Games at Pyeongchang Stadium on February 9, 2018.
The two Koreas marched in behind a white flag that was emblazoned with a map of the Korean peninsula depicted in blue.
The grand event which will run through February 25 will see 2,920 athletes competing for 92 nations with a record 102 gold medals at stake.
Switzerland's Alina Muller nearly single-handedly spoiled Korea's Olympic unity moment on Saturday, scoring four goals to power the Swiss to an 8-0 win over Korea's unified women's ice hockey team.
North Korean leader Kim Jong Un invited the South's President Moon Jae-in for a summit in Pyongyang Saturday, Seoul said, even as the United States warned against falling for Pyongyang's Olympic charm offensive.
Its agents blew up a South Korean airliner ahead of the 1988 Seoul Olympics in an attempt to dissuade visitors; then it boycotted its rival's Olympic debut on the world stage.
Her presence overshadowed the nominal head of the delegation, Kim Yong Nam, the aging head of the North Korean Parliament.
"By virtue of her family ties, Kim is among the most credible interlocutors that North Korea could have sent", said Christopher Green, a senior adviser on Korean affairs at the International Crisis Group think tank.
Pyongyang conducted its largest nuclear test a year ago and said it had developed a missile capable of carrying a warhead to the United States.
Abe urges Moon to respect 2015 accord / PM reaffirms position on comfort women deal
Pence had said all week that if he met with the North Koreans, he would deliver a tough message.
So as pleasant as that lunch between North and South Korean leadership may have been, it won't mean much until diplomats from the USA settle in for some of the local delicacies.
That stance, though, could complicate South Korea's relations with the United States.
"As we speak, an estimated 100,000 North Korean citizens labor in modern-day gulags", Pence said.
"North Korea is continuing to develop nuclear weapons at this very moment", Japanese Prime Minister Shinzo Abe told Moon in a one-on-one meeting Friday. She arrived here Friday as part of a delegation to the Olympics.
So far, the South Korean President seems keen to take up his North Korean counterpart's offer, which comes as no surprise.
Moon has embraced the games as an opportunity for a thaw in tensions, calling them "Olympic Games of peace".
"She also delivered a message from Kim Jong-un that he is willing to meet President Moon Jae-in in the near future and that he hopes President Moon visits the North at a convenient time".
The U.S. president welcomed the Olympics détente and Washington agreed to suspend annual war games with the South until after the games and the subsequent Paralympics. Moon asked the delegation, before reporters were ushered from the room.
He also ratcheted up his rhetoric on the North's human-rights abuses in a speech to USA service members at Yokota Air Base in Japan.
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