High-Level talks between the two sides were held on January 9. The pre-Olympic events are likely to start with joint ski training in the North at the Masikryong Ski Resort. North Korea will send 22 athletes to compete in alpine skiing, cross-country skiing, short track speed skating, figure skating and hockey, according to BBC.
Stratfor, a USA geopolitical intelligence group, said recently that the United States may end up standing by as the DPRK promotes its nuclear weapons development.
Japan-South Korea ties are also connected to Japan's relationship with China, which has recently shown signs of a thaw. The airfield is a 45-minute drive from the ski resort, said the official.
"Giving fair opportunities is a good value but the fact that South and North Koreas used to be a single country is as good as fair opportunities", he said.
Mattis also plans to meet with South Korea's Minister of National Defense Song Young-moo, who's also on Oahu.
The two Koreas have already agreed to form a unified team for women's hockey.
The South may have to bring refined petroleum products to the North when it holds the cultural event there, as Pyongyang said it will be hard for it to stably supply power to a facility built by the South Korean side.
Meanwhile, T-Mobile US customers have absolutely nothing to do after setting foot on South Korean soil to enjoy pretty much the same benefits as back home.
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A State Department official added: 'There is no more time for excuses.
With the Winter Olympics in South Korea approaching, Washington and Pyongyang have tamped down harsh rhetoric toward each other, although USA experts said the calm may be temporary.
Kim likened the latest United Nations resolution to an "act of war" and threatened retaliation, prompting a new round of US, North Korean sabre-rattling.
"The South is considering playing modern and traditional music and holding literary events. The North Koreans are apparently focusing on traditional music".
Experts say tourism is an important part of Kim's plans to boost the country's economy. His participation has heightened expectations of K-pop elements being incorporated or featured in the joint performance.
"The government sees no problem in hosting practice sessions and joint training", a unification ministry official was quoted as saying by Yonhap. They are set to wrap-up their three-day trip on Saturday.
Mattis has repeatedly insisted that US efforts to disarm North Korean leader Kim Jong Un are "diplomatically led", while also saying that he has developed military options for any potential war.