Officials in Tokyo suspect the North is trying to chip away at the united front that groups the US together with its East Asian allies amid biting worldwide sanctions on the hermit country.
The Abe administration remains in favor of maintaining the diplomatic and economic pressure campaign - regardless of the Olympic thaw between the two Koreas. He also called for the need of a quick resumption of dialogue between North Korea and the United States.
North Korean cheerleaders, wearing full-length red jumpsuits and white caps, lined up with mini-skirted dancers from the South, dressed all in black and knee-high boots.
Kim Yo Jong, the younger sister of Kim Jong Un, "courteously" handed over a personal letter from the North Korean leader to Moon during talks on Saturday and also told Moon of her brother's "intention", KCNA said, without elaborating on what that was. If peace isn't imminent, a summit in Pyongyang between Moon and Kim Jong Un seems preferable to recent months' threats.
Moon has always expressed a desire to reach out to North Korea.
"North and South must work together to alleviate the tensions and work together as a people of the same heritage to find peace and stability", Kim Jong Un said in a major January speech.
And while the unified Korean Olympic team received a standing ovation as they marched into the stadium Friday night, Pence remained seated, which critics said was disrespectful of the athletes and his host, Moon.
In 2012, Kim donated hundreds of thousands of dollars to Salesian of Don Bosco to help support the missionary brothers in South Sudan and to establish Catholic Schools throughout the war-torn country, meeting with Salesian brothers in Seoul to personally deliver the gift.
Some even went so far as to set a North Korean flag on fire, prompting police to intervene.
However, South Korea's main opposition party warned any talks between the two Koreas where the scrapping of North Korea's nuclear programme was not a precondition would only "benefit the enemy".
In previous years, North and South Korea have held reunions to bring together family members who have been separated by the war.
There's worry, too, that the proposed summit in Pyongyang may come with preconditions - a North Korean specialty. In it, Kim Jong Un highlighted several huge intercontinental ballistic missiles, which were successfully flight tested three times a year ago and could reach deep into the USA mainland when perfected.
Pictures showed Kim Yo-jong sitting between Moon and the North's ceremonial head of state Kim Yong-nam, who is officially leading the North's delegation, and applauding at Sunday's concert.The show by Pyongyang's Samjiyon Orchestra featured a surprise appearance by Seohyun, of top South Korean K-pop girl band Girls Generation.