Pyongyang said it will detonate explosives in all tunnels of the test ground, completely block entrances, remove all observation facilities, research institutes and structures of guard units at the test-facility. Analysts say that while the closure of the site is important, it doesn't represent a material step toward full denuclearization.
Journalists from the United States, Russia, South Korea, China and Britain will be invited to witness the process, North Korea state media said Saturday.
All worldwide journalists will be provided with a charter flight into Wonsan, a port city in eastern North Korea, from Beijing, KCNA said.
"The DPRK will, also in the future, promote close contacts and dialogue with the neighbouring countries and the global society so as to safeguard peace and stability on the Korean peninsula and over the globe", the North Korean foreign ministry statement carried by KCNA said Saturday.
Kim has declared the development of the North's nuclear force complete and that it had no further need for the site.
The official also said Kang held a separate meeting with US Defense Secretary James Mattis and stressed that the stationing of US troops in South Korea is an issue of their bilateral alliance but not one to be discussed with North Korea.
Dialogue brokered by Seoul has seen US-North Korea relations go from trading personal insults and threats of war past year to a summit between Kim and President Donald Trump due in Singapore on June 12. However, there are lingering doubts about whether Kim would ever agree to fully relinquish the weapons he likely views as his only guarantee of survival.
At the summit in late April, Kim and Moon pledged to work toward the total denuclearization of the Korean Peninsula and to sign a peace treaty formally ending the Korean War, which has technically been ongoing since the fighting stopped via an armistice in 1953.