The high-ranking North Korean delegation had landed in South Korea earlier in the day aboard Kim Jong Un's white private jet which had the Democratic People's Republic of Korea, North Korea's official name, inscribed in black in Korean on its side, followed by the North Korean flag.
North and South Korea may be bitterly divided, but at the Olympics, they are anything but.
Abe is also believed to have asked Moon to steadily implement the 2015 Japan-South Korea agreement on the issue of those referred to as comfort women.
On his flight to Alaska on Saturday, the vice president said he left Asia "encouraged that we will continue to work very closely to continue and intensify the maximum pressure campaign" against North Korea.
At the meeting Saturday, Moon was joined by his national security director, intelligence chief, chief of staff and the unification minister, according to the Associated Press.
She is due to have a sit-down luncheon tomorrow with President Moon along with the rest of the North Korean delegation - including the man sat next to her Kim Yong-nam.
It remained unclear whether Kim would be carrying a message from her brother to Moon, who has said he is willing to meet Kim Jong Un if he is reasonably sure that such a meeting would help end the crisis over the North's nuclear weapons.
Prior to the opening ceremony on Friday night, Pence arrived late to a dinner reception between the two Koreas and greeted everyone at a main table except for Kim Yong Nam, North Korea's nominal head of state, Reuters reports.
In an extraordinary moment that could hardly be fathomed one month ago, North and South Korea have entered the PyeongChang Olympic Stadium together.
But the overture also has the potential to divide South Korea from the U.S., its main military ally. Speaking to NBC's "Nightly News" on Thursday, the vice president continued to stress that the United States would protect itself from North Korean nuclear threats by taking whatever "action is necessary to defend our homeland".
"But we're gonna make it crystal clear that our military, the Japanese self-defense forces, our allies here in South Korea, all of our allies across the region, are, are fully prepared to defend our nations and to take what is - action is necessary to defend our homeland", he said.