Some observers have suggested that the North is trying to drive a wedge between South Korea and its American ally.Pence, who will lead the US delegation, has vowed to prevent Kim from "hijacking the message and imagery" of the Olympics.
Mattis also said the situation with North Korea is "firmly in the diplomatic lane", a reminder the United States has postponed joint exercises with the South for the duration of the games.
Arriving with the cheering squad was North Korea's Sports Minister Kim Il-guk, Olympic committee officials and a demonstration taekwondo team that will perform before the opening ceremony on Friday and again later in Seoul.
South Korean tours to the Mt Kumgang resort were closed after a South Korean tourist was shot by a North Korean guard there in 2008.
But Mr Pence warned that the countries had previously "marched under the same banner" at past Olympics "only to see North Korea continue its pursuit of threats and provocations".
Noh added that such "exceptions" would be limited to the period of the South hosting the Winter Olympics this month. The North also held a military parade with tanks and tens of thousands of troops in its capital Thursday to mark the 70th anniversary of the founding of its military. The restaurant, which holds 160 customers, is in the shape of a burger, fries, and a drink. The promotion is a sign Kim Jong-Un is consolidating his position by drawing his most important people closer to the centre of power.
Tensions soared last year as the North carried out multiple weapons tests.
A television screen broadcasting a report on North Korean Leader Kim Jong Un is displayed onboard a shuttle bus for the 2018 PyeongChang Winter Olympic Games.
"As the Chinese saying goes, 'one day of cold weather will not result in three feet of ice.' Given the complex circumstances, let us work together with patience".