Of course, if North Korea moves forward with new provocations - such as missile or nuclear tests - all bets are off. With that, he had met with all the delegates and heads of state from the four key powers in the region, minus Russian Federation, since he'd met with U.S. Vice President Mike Pence and Chinese Special Envoy Han Zheng just a day before.
North Korea has sent a delegation of 22 athletes to compete in five disciplines, with their women's ice hockey players to compete in a unified Korean team.
It has now eclipsed these efforts by unleashing a total of 1,218 Shooting Star drones in South Korea.
They are scheduled to watch a concert in Seoul, performed by the visiting North Korean art troupe, together with Mr Moon.
Russia, which has been banned from the Games for doping, said days before the opening ceremony that any allegations linking Russian hackers to attacks on the infrastructure connected to the Pyeongchang Olympic Games were unfounded.
U.S. Defense Secretary Jim Mattis said on Sunday it was too early to tell whether a diplomatic detente between the two Koreas at the Winter Olympics would lead to results, but the move had not driven a wedge between Washington and Seoul. She passed on a message from Kim, who invited Moon to visit Pyongyang "at a convenient date".
On Saturday, Kim's sister, Kim Yo Jong, then delivered an invitation from Kim to Moon to travel to North Korea later this year. North Korean and South Korean athletes have marched together at past Olympics, most recently in 2006.
English Premier League match report Tottenham Hotspur v Arsenal 10 February 2018
Tottenham can move third if they win, at least until Liverpool play Southampton on Sunday and Chelsea play West Brom on Monday. There was only four minutes gone in the second half when Kane finally got his goal .
Pence said he and Moon spoke as "friends" and are completely aligned on the need to increase diplomatic and economic pressure on North Korea.
Moon's government is clearly more optimistic than the Trump administration about the potential for the Koreas' cooperation at the Olympics to create the groundwork for substantial discussions.
Neither did Pence shake hands with Kim Yong Nam while making a brief appearance at a leaders' reception ahead of the ceremony - although Japanese Prime Minister Shinzo Abe did so. The supporters waved blue and white flags that showed an undivided Korean Peninsula.
North Korea has also been blamed for a series of cyber incidents including the WannaCry global ransomware attack, which infected 300 000 computers worldwide last May. China has suggested that talks could start if the United States suspended its regular joint military exercises with South Korea, and if North Korea reciprocated by shelving nuclear and missile tests. It's clear both sides decided it was not in their interest to go along with Moon's wishes at this time.
"Under a strong position for denuclearisation of the Korean peninsula, Korea will faithfully implement the worldwide sanctions on North Korea, while also adhering to the principle of resolution through peaceful means", the statement said.
Some analysts were skeptical of that prospect.