North Korea's high-level officials including its leader Kim Jong-un's younger sister Yo-jong arrived in South Korea aboard a chartered plane on Friday. They arrived at Incheon International Airport at around 1:40 p.m.

Some aspects of the visit violate international sanctions and could weaken international efforts to pressure the regime into giving up its nuclear weapons program.

Kim Yo-jong is on a U.S. Treasury blacklist and subject to having her overseas assets frozen but not on a UN Security Council blacklist that prevents North Korean officials involved in the nuclear development from traveling.

The delegation is headed by North Korea's titular head of state Kim Yong-nam, a nonagenarian who is a mere figurehead and not on any blacklist. Cheong Wa Dae spokesman Kim Eui-kyeom told reporters that President Moon Jae-in will meet the North Korean delegation and have lunch with them. Government officials hope they will bring a letter from Kim Jong-un.

Under the UNSC sanctions, all North Korean passengers and cargo must be thoroughly searched, but this is highly unlikely to happen.

Kim Jong-un owns two antiquated Soviet-era passenger planes, Antonov AN-148 and an Ilyushin IL-62. A Unification Ministry official said, "I believe they are not subject to any sanctions."