Choi Jiyeon (C) of the unified team of the Democratic People's Republic of Korea (DPRK) and South Korea drives the puck during their preliminary match of women's ice hockey against Switerland at the Pyeongchang 2018 Winter Olympic Games at the Kwandong Hockey Centre in Gangneung, South Korea, on Feb. 10, 2018.
North Korea leader Kim Jong-un's sister, Kim Yo-jong, was in attendance alongside South Korea's president Moon Jae-in and North Korea's nominal head of state, Kim Yong-nam. The 2014 Sochi Game did not live up to the successes of Vancouver in 2010 - but proximity and time zones played a large role in that. The two sides are still technically at war.
Any meeting would represent a diplomatic coup for Moon, who swept to power last year on a policy of engaging more with the reclusive North. Moon had said "let's create conditions to make it happen", the official said, an indication that Moon was likely to accept the invitation.
North Korea's cheerleaders don masks during a routine.
Cybersecurity firm ThreatConnect says a hacking unit with Russian ties called "Pawn Storm" recently sent malicious emails to the International Ski Federation, International Ice Hockey Federation, and several other organizations with a stake in the winter games. Just a few years younger than her brother, she is believed to be his closest confidant and is a senior cadre in North Korea's ruling party.
Pence said the United States and South Korea were closely aligned in their approach to dealing with North Korea.
Shortly before the ceremony, the official Pyeongchang 2018 site stopped working, with users unable to access information or print tickets for events.
Dr Bong Young Shik, of Yonsei University's Institute for North Korean Studies, said the denuclearisation issue "must be part of the equation of the inter-Korean summit". Their task is to ensure nobody defects because it would be "a huge embarrassment for the North". President Donald Trump time and time again has denigrated the need to talk with the north, leading to tensions between Seoul and Washington over how best to engage Pyongyang. "You gain some, and you lose some". Pence and his wife, who also attended the Winter Games opening ceremony, were the only people in the VIP seating section to not stand and clap during the Korean unity demonstration.