President Muhammadu Buhari on Friday extended his best wishes to Team Nigeria as the 2018 Winter Olympics began in PyeongChang, South Korea.

"We will continue to isolate North Korea until it abandons its nuclear and ballistic missile program once and for all".

Kim Yo Jong made the comments on Saturday during a luncheon hosted by Moon at Seoul's presidential palace where she delivered her brother's invitation for a summit meeting in Pyongyang.

The official said Pence and Moon did not discuss the North Koreans' invitation to Moon for a summit in Pyongyang, which would set the stage for the first meeting of Korean leaders in 10 years. Kim Jong Un's sister, Kim Yo Jong, delivered that message during her meeting with Moon on Saturday.

The recent detente, anchored by South Korea's hosting of the Winter Olympic Games, came despite an acceleration in the North's weapons programme past year and pressure from Seoul's allies in Washington.

Team USA usually marches into the Olympic stadium near the end of the opening ceremony. On the other, the president of South Korea sat with Kim's sister and North Korea's nominal head of state, separated only by IOC President Thomas Bach.

US Vice President Mike Pence, who was seated next to Moon, stared ahead as the ceremony unfolded.

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Some North Korean experts believe tough United Nations sanctions that are cutting off most of the isolated regime's sources of revenue might pressure Pyongyang to further engage with Seoul. They said Pence could have opted to sit with the U.S. delegation and avoided the box that included the North Koreans.

Though it has no real medal contenders and sent only 22 athletes, North Korea has turned out to be a major political player in Pyeongchang.

Talks between North and South Korean leaders have happened in the past without yielding any significant changes in North Korea's behavior. So, too, did the problems of integrating the required minimum of three North Koreans on the squad in just a few days time.

Among the major highlights were American luger Erin Hamlin, a four-time Olympian who served as Team USA's flag bearer.

Moon and Kim Yo Jong broke out broad smiles as they shook hands before the start of the opening ceremony. Moon and Vice President Mike Pence watched the proceedings from the VIP balcony in the stadium, and they were joined by Kim Yo Jong.

Vice President Mike Pence is cheering on US speed skaters at the Winter Olympics, before departing South Korea for Washington on Saturday.