The U.S. has formally been demanding that the North, formally known as the Democratic People's Republic of Korea, or DPRK, drop its nuclear and long-range missile programs amid reports that it could hit mainland North America.
The US has been urged to get accustomed to Asian culture to conduct successful denuclearisation talks with the hermit country by Hitoshi Tanaka, a former Japanese deputy foreign affairs minister.
This series of talks come after several months of unprecedented global engagement by the isolated North, which started with Winter Olympic participation in South Korea and included a letter offering talks to U.S. President Donald Trump.
A source in North Korea's Yanggang Province said the site was a source of fear, because North Koreans anxious their children could be conscripted to serve at the site, where soldiers sometimes returned after being exposed to radiation.
Japan is also weighing high-level, direct talks with North Korea, potentially an August meeting between the two countries' foreign ministers, local media said Wednesday.More news: The 5 biggest new features in iOS 11.4
Pyongyang has a different view of denuclearisation and remains deeply anxious that abandoning its deterrent would leave it vulnerable, especially while the United States maintains a robust military presence in South Korea.
Moon, who has lobbied hard for nuclear negotiations between Trump and Kim Jong Un, held a surprise meeting with the North Korean leader on Saturday in an effort to keep the summit alive. -North Korea summit produce results on the issue of the North's denuclearization.
The last ministerial-level talks between Tokyo and Pyongyang were in 2015, also on the sidelines of an Asean meeting.
Pompeo talks with Kim Yong Chol - the most critical of three tracks of negotiations now taking place between the two governments in the US, in the heavily fortified Korean Demilitarized Zone, and in Singapore - are aimed at determining whether a meeting between Trump and Kim Jong Un, originally scheduled for June 12 but later cancelled by Trump, can be restored. Spokeswoman Sarah Huckabee Sanders said Trump will host Japanese Prime Minister Shinzo Abe of Japan on June 7 to coordinate their thinking ahead of the summit.