Pence is leading the USA delegation to the opening ceremonies, where he has worked to pour cold water on warming ties between the two Koreas.
Park said Saturday that the systems had been "normalized" without giving details.
Some North Korean experts believe tough United Nations sanctions that are cutting off most of the isolated regime's sources of revenue might pressure Pyongyang to further engage with Seoul.
"It is a custom and very basic common sense that any country in the world takes the founding of its military very seriously and celebrates it with extravagant events", said the ruling Workers' Party newspaper, the Rodong Sinmun. International Olympic Committee President Thomas Bach then handed the podium to Moon, who declared the Olympics officially open. The article reiterated that the North's decision to send delegates to the South had nothing to do with an attempt to approach the United States for talks.
The Feb. 6 front-page article "Her penance, after trying to disrupt the Olympics " awakened all people to North Korean terrorism, not only Americans but also South Koreans.
Pence and the North Koreans have been an awkward presence at the games to say the least.
But Pence did not join the joyous welcome for the Korean detente: he remained seated with his wife, Karen Pence, and Japanese Prime Minister Shinzo Abe, while others in the VIP box rose to cheer on the Koreans.
Japanese Prime Minister Shinzo Abe restated Tokyo's opposition to revising a 2015 agreement on "comfort women" in talks with South Korean President Moon Jae-in on February 9, calling the deal a promise between nations and the basis of two-way ties. "I heartily support the president's call to celebrate our military". They also made the symbolic gesture at the opening of the 2000 and 2004 Olympics in Sydney and Athens.
Moon said improved relations between the Koreas may be a step toward resolving the nuclear standoff.
At the event Mr. Moon said he hoped the Winter Olympics would be remembered as the "day peace began". Moon asked the delegation, before reporters were ushered from the room. North Korea's President Kim Jong-un pointed that out as well by stating that his country has become "a "world-class military power", according to BBC".
A rare show of unity by North and South Korea has occurred at the opening of the Winter Olympics.
Kim Yong Nam, president of the Presidium of the DPRK Supreme People's Assembly, and his delegation held a brief meeting with Moon when attending the ceremony, the report said.
There is a palpable excitement in this isolated, rugged mountain town, as one of the poorest, coldest and most disgruntled parts of an otherwise prosperous South Korea kicks off two weeks of winter sports, spectacle and, from the looks of things, some inter-Korean reconciliation.
It has been speculated that the leadership of the North might invite Moon to visits there later this year.
The sister of the North Korean leader has arrived in South Korea, dressed in a black coat and absorbing a barrage of camera flashes.
The Pyeongchang Olympics will be the largest Winter Games, drawing 2,925 participants from 92 countries, compared with the 2,858 athletes from 88 countries who attended the 2014 Sochi Olympics.
DPRK parliamentary leader Kim Yong-nam heads the North Korean governmental delegation at the ceremony, which started at 20:00 hours, local time.