"Moon's objective should be to smooth the way for America and North Korea to be talking", he said.
But the invitation to Pyongyang thrusts Mr. Moon into a potentially delicate diplomatic dance, as South Korea's allies and neighbours maintain a hardline stance toward Mr. Kim and his weapons program.
Official media of the Democratic People's Republic of Korea (DPRK) Saturday highlighted the attendance of Kim Yo Jong, sister of DPRK top leader Kim Jong Un, at the PyeongChang Olympics opening ceremony on Friday.
Mr. Sung said that the organizers sold 99 percent of 35,000 tickets to the opening ceremony, though viewers noticed many empty seats.
South Korea's president has received an invitation to visit the North - an offer that came from the younger sister of the North's dictator.
Relations between the two countries have remained fraught ever since.
As it turned out, with the two Koreas celebrating a moment of unity, the United States was left outmaneuvered by an adversary and out of step with an ally.
But experts are skeptical of Pyongyang's motives.
Park said Saturday that the systems had been "normalized" without giving details.
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Wearing matching uniforms of red, the "army of beauties", as they have been dubbed in South Korea, performed perfectly synchronised routines and songs from the stands, much to the amusement of the crowds and press.
Pyongyang conducted its largest nuclear test a year ago and said it had developed a missile capable of carrying a warhead to the United States.
On Wednesday, Pence announced the "toughest" round of sanctions yet targeting North Korea at a news conference alongside Japan's Prime Minister Shinzo Abe.
"The worldwide community continued its efforts towards dialogue with North Korea with great perseverance".
As First Vice Director of the Central Committee of North Korea's ruling Workers' Party, Kim has been an increasingly prominent figure in North Korea's leadership and is considered one of the few people who has earned her brother's absolute trust. "We thank you", Bach said.
Pence said Friday the US would oppose talks between the two Koreas until the North agreed to open negotiations on ending its nuclear program.
"We will continue to intensify our maximum pressure campaign until North Korea takes concrete steps for complete, verifiable and irreversible denuclearization", Pence said, calling on South Korea to work in tandem.
When asked about her experience with North Korean athletes, she said she did not encounter too many problems although at times it was hard to understand them because of the language differences.