North Korea's Foreign Ministry announced Saturday that it will dismantle the test site between May 23 and 25.
"North Korea has announced the dismantling of the Punggye-ri nuclear test site, so we assess that they will do preparatory work according to the planned schedule", he said.
A final analysis of satellite images taken on North Korea's atomic evidence base shows "a first definitive test" that regime is dismantling site.
The site has been used for each of its six underground nuclear test explosions. The regime later said it would invite journalists from China, Russia, the United Kingdom and the USA between May 23 and May 25 to observe the collapse and closing of test tunnels and other facilities. Chinese geologists claimed in a study the cavity caused by last September's nuclear test collapsed shortly after the detonation, causing a powerful tremor.
A campaign of diplomacy has allowed tensions to ease on the Korean Peninsula, but they were high throughout much of 2017, fueled by North Korea's missile tests and its advancing nuclear weapons program, as well as US military exercises and Trump's threatening statements.
Kim pledged to close the complex after his historic meeting with South Korean president Moon Jae-in, saying North Korea no longer needed the site. The site is where 5 of the past 6 nuclear tests were conducted.
North Korea's reference to such activity is created to communicate that even without underground testing, the country intends to maintain its nuclear arsenal and be a "responsible" steward of those weapons at the same time, said Andrea Berger, a senior analyst at the Middlebury Institute of International Studies.
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"In the end, North Korea will remain 'a nuclear power packaged as a non-nuclear state, '" said Thae Yong Ho, the hermit kingdom's former deputy ambassador to the UK, Agence France-Presse reported.
When asked if human rights would be on the agenda at the summit, for example, Pompeo said: "America's interest here is preventing the risk that North Korea will launch a nuclear weapon into LA or Denver".
Trump welcomed the North Korean announcement.
The two Koreas are due to meet for a high-level meeting on Wednesday to discuss follow-up measures from their summit last month, Seoul's unification ministry said.
"North Korea's diplomacy has always been a repeat of hardline and appeasement", Thae added.
South Korea had no immediate response to the statement.