A Kyodo News Agency poll also found that 53 per cent of Japanese favoured ramping up pressure to make the North give up its nuclear and missile programmes.
President Moon hosted Kim at the presidential mansion for lunch on Saturday - a session in which Kim extended an invitation for Moon to visit North Korea later this year.
"For our side, for the sports side, this dialogue will continue.", he said, adding that the IOC was in constant dialogue with North Korea's national Olympic committee. While it would be a diplomatic coup for Moon, who was elected on a promise to pursue warmer relations with the North, it could strain relations with the United States, which has appeared uncomfortable at the warm welcome afforded to the North Korean delegation over the past few days.
Kim Jong Un has invited Moon for talks in Pyongyang, South Korean officials said, setting the stage for the first meeting of Korean leaders in more than a decade. "I thought things would be unusual and very different, but I found a lot of things being similar", Kim said at Sunday's dinner, according to Moon's office.
"It is one we are dealing with".
Mattis said it's unclear "if using the Olympics in a way to reduce tension - if that's going to have any traction once the Olympics are over. We can't say right now".
Vice-President Mike Pence's efforts to keep North Korea from stealing the show at the Winter Olympics proved to be short-lived, quickly drowned out by the images of the two Koreas marching and competing together, as the South appeared to look favourably on warming ties on the Korean Peninsula.
Of the three, the North Koreans might be the easiest sell. Kim Yo Jong offered an invitation from her brother for Moon to visit the North, in the strongest sign yet of an expanding diplomatic opening opposed by the U.S. After the game, the entire group walked around to the Koreans' bench to greet them and pose for photos.
They shared the VIP box with world leaders at the opening ceremony and joined Moon in cheering for the first-ever inter-Korean Olympic team as it debuted in the women's ice hockey tournament.
One telling incident came early.
Vice President Mike Pence was at pains to insist that Washington and Seoul were on the same page as he returned to Washington from leading the USA delegation to the Olympics. It warned against agreeing to talks before North Korea scrapped its nuclear program, saying it would only "benefit the enemy".