President Trump thanked the Koreans for their "kind and gracious gesture".
The dismantlement of the Punggye-ri nuclear test site will take place between May 23-25, North Korean state media says.
It will involve the removal of all research buildings, observation facilities and security posts.
Six nuclear tests - including North Korea's most powerful test to date in September 2017 - have been carried out at the facility since Pyongyang began experiments in 2006.
We will remind that the meeting of U.S. President Donald trump with the North Korean leader Kim Jong UN, scheduled for June 12 in Singapore.
Friday's statement from the UN's International Civil Aviation Organization (ICAO) followed a visit by its representatives to the North Korean capital, Pyongyang, earlier this week. Given the stage it had already reached, Pyongyang "may feel like they don´t need to test anything for a while", he said.
Lawyer Says He Consulted Cohen on Schneiderman Accusers
He says Avenatti appears to have "reckless" behavior, and wants to make sure that he doesn't get his hands on the private records. The letter closes with an unexpected dig at Michael Avenatti , the attorney who represents Trump accuser Stormy Daniels .
In addition to pledging an end to unannounced missile testing, North Korea said its "national nuclear arms program was complete" according to the United Nations agency.
The United States aspires to have North Korea as a "close partner" and not an enemy, Secretary of State Mike Pompeo said, noting the U.S. has often in history become good friends with former adversaries.
There, newsmen will board a charter train to the nuclear test ground in an "uninhabited deep mountain area".
In November, North Korea boasted that it had developed a missile capable of striking the whole United States mainland.
During their summit at a border truce village, Moon and Kim vaguely promised to work toward the "complete denuclearization" of the Korean Peninsula, but made no references to verification or timetables.
And as the eyes of the world turn toward North Korea, it will be under pressure to deliver on its show of goodwill by committing to further steps to denuclearize the peninsula.