It was a historic moment, and it happened even before the Pyeongchang Winter Olympics had officially begun.

As South Korean President Moon Jae-in and his wife greeted VIPs in their dignitary box to watch the opening ceremonies, they turned to shake hands with North Korean leader Kim Jong Un's younger sister, who arrived earlier in the day on an unprecedented visit to the South by a member of the North's ruling Kim family.

All broke out in broad smiles.

Kim's sister, Kim Yo Jong, was at the opening ceremony with North Korea's nominal head of state, 90-year-old Kim Yong Nam. They are part of an extraordinary diplomatic push by the North aimed at using the Olympics to ease tensions with Seoul and bolster unity between the two Koreas after a year that has been marked by escalating fears of war and increasing angry rhetoric between Pyongyang and Washington.

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