But as diplomats make progress toward further summits, Seoul is moving ahead.
The liaison office in the empty industrial park occupies a building previously used by junior-level South Korean government officials who oversaw the private sector operations at the complex.
The statement did not name any specific countries, but U.S. Ambassador Nikki Haley on September 13 accused Russian Federation of altering an independent United Nations report to cover up Moscow's alleged violation of the sanctions.
Pompeo said North Korea is also evading sanctions by smuggling coal by sea and across borders, by using cyber thefts and other criminal activities, and by keeping workers in some countries that he didn't name.
The results of the talks are likely to be included in the envisioned military agreement, which is expected to be officially adopted by President Moon Jae-in and his North Korean counterpart Kim Jong-un during their third summit slated to occur in Pyongyang from September 18-20.
Moon and Kim held their first summit in Panmunjom on April 27 and met for the second time on May 26.
Drones carrying lights formed the words "Shining Fatherland" in the night sky as part of the choreographed spectacle that involved tens of thousands of people and featured acrobatics, dancing and huge mosaics created by students holding up colored cards.
In February 2013, Washington imposed sanctions on a number of Chinese businesses that aided North Korea with its nuclear weapons program.
"There is no need for the north and the south in their relations to read other's face and hesitate", North Korea's most influential newspaper added, emphasizing a thaw in inter-Korean ties.
About 15-20 South Korean officials will work at the office from 9 to 5, sleep at nearby lodgings in Kaesong on weekdays and take turns staffing the office on weekends.
The building includes separate Northern and Southern offices and a joint conference room, and is meant to facilitate cross-border exchanges following the Panmunjom Summit between Moon and the North's leader Kim Jong Un, the unification ministry said.
The report submitted to the Security Council's North Korea sanctions committee last month said Pyongyang had not stopped its nuclear and missile programs and was violating United Nations sanctions on exports. -South Korea summit in May. "We can not cease our efforts to mediate and facilitate talks from the middle until dialogue and communication between North Korea and the United States flow smoothly".
"It's not a losing game for Trump - inducing North Korea's commitment to facility declarations and inspections would itself be a diplomatic coup for him", Shin said. The president also tweeted, "We will both prove everyone wrong!"
In the Thursday briefing to reporters, Moon Chung-in said if he could advise Kim Jong Un during the summit, he would suggest the North Korean leader take the initiative with his own bold move. -North Korea summit, Kim committed to "complete" denuclearization of the Korean Peninsula, but Pyongyang has yet to provide a full inventory of nuclear weapons and fissile materials, as Washington has demanded.