Ahead of the reception, hosted by South Korean President Moon Jae-in, South Korean media said Mr Pence was expected to be seated opposite Kim Yong-nam, North Korea's nominal head of state, at the head table.
Earlier Friday, Pence traveled to the South Korean Navy's 2nd Fleet Command in Pyeongtaek, 70 kilometers south of Seoul, to visit a memorial for the South Korean warship Cheonan, which was sunk by an explosion blamed on the North. North and South Korea made a joint entrance under a unified Korean Peninsula flag at the opening ceremony.
Meanwhile, according to reports, there were anti-Korean unification protests outside the stadium.
Pence is leading the US delegation to the Pyeongchang Games' opening ceremonies and will also participate in symbolic events meant to shine a spotlight on North Korea's nuclear program and human rights abuses.
The opening gala was attended by North Korean President Moon Jae-in and about 200 leaders from several countries and global organizations.
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Under the 2015 deal between Japan and South Korea, reached by Abe and Moon's predecessor, Japan apologized to former "comfort women" and provided a 1 billion yen ($9 million) fund to help them.
The games are taking place amid an global standoff over North Korea's nuclear weapons, but I thought the official role of the Olympics was for us to have a place where we leave all that stuff at home?
"In the midst of all of this, he (North Korean leader Kim Jong Un) ran a military parade that highlighted his ballistic missiles", Mattis told reporters on his plane en route to Rome on the first leg of a European tour. "We want peace, everybody wants peace, nobody wants war".
Ever since, the US military has deterred the Kim regime from attacking the South in full force.