SEOUL, South Korea — President Donald Trump thanked North Korea for saying on Saturday that it would dismantle its nuclear test site between May 23 and 25, in a dramatic event that would set up leader Kim Jong Un's summit with Trump next month.

"North Korea has announced that they will dismantle Nuclear Test Site this month, ahead of the big Summit Meeting on June 12th. Thank you, a very smart and gracious gesture!" Trump wrote in a tweet Saturday evening.

In a statement carried by state media, North Korea's Foreign Ministry said that all of the tunnels at the country's northeastern testing ground will be destroyed by explosion, and that observation and research facilities and ground-based guard units will also be removed.

Kim had already revealed plans to shut down the test site by the end of May during his summit with South Korean President Moon Jae-in last month. Analysts say that while the closure of the site is important, it doesn't represent a material step toward full denuclearization.

The North plans to invite journalists from the United States, South Korea, China, Russia and Britain to witness the dismantling process, the Foreign Ministry's statement said.

"A ceremony for dismantling the nuclear test ground is now scheduled between May 23 and 25," depending on weather conditions, it said.

North Korea has announced that they will dismantle Nuclear Test Site this month, ahead of the big Summit Meeting on June 12th. Thank you, a very smart and gracious gesture! — Donald J. Trump (@realDonaldTrump) May 12, 2018

The journalists from the five selected countries will be provided with a charter flight from Beijing to the North Korean coastal city of Wonsan, from where they will travel by train to the test site, the statement said.

The ministry said the North will continue to "promote close contacts and dialogue with the neighboring countries and the international society so as to safeguard peace and stability on the Korean Peninsula and over the globe."

Following the Moon-Kim summit, Moon's office said Kim was willing to disclose the process to international experts, but the North's statement Saturday didn't include any mention about allowing experts on the site.

South Korea had no immediate response to the statement.

The North's announcement comes days after Washington announced that the historic summit between Kim and Trump will be held June 12 in Singapore.

Seoul, which shuttled between Washington and Pyongyang to set up the Trump-Kim meeting, has said Kim has genuine interest in dealing away his nuclear weapons in return for economic benefits. 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.

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.

Excavation continued underground on Oct. 19, 2016 in the North Portal area at the Punggye-Ri Nuclear Test Site, suggesting more tests to come in the same tunnel complex directly under Mt. Mantap. DigitalGlobe / 38 North via Getty Images

North Korea for decades has been pushing a concept of "denuclearization" that bears no resemblance to the American definition. The North has been vowing to pursue nuclear development unless Washington removes its 28,500 troops from South Korea and the nuclear umbrella defending South Korea and Japan.

Some experts believe Kim may try to drag out the process to wait out the Trump administration or seek a deal in which he gives away his intercontinental ballistic missiles but retains some of his shorter-range arsenal in return for a reduced U.S. military presence in the South. This could satisfy Trump but undermine the alliance between Washington and Seoul.

Kim declared his nuclear force as complete in December, following North Korea's most powerful nuclear test to date in September and three flight tests of ICBMs designed to reach the U.S. mainland.

North Korea announced at a ruling party meeting last month that it was suspending all tests of nuclear devices and ICBMs, as well as the plan to close the nuclear testing ground.

Kim said during the meeting that the nuclear test site's mission had come "to an end" because the North had completed the process of developing nuclear-capable intermediate-range missiles, ICBMs and other strike means.

The North also said for the first time at the meeting that it had been conducting "subcritical" nuclear tests. These refer to experiments involving a subcritical mass of nuclear materials that allow scientists to examine the performance and safety of weapons without triggering a nuclear chain reaction and explosion.

North Korea's reference to such activity is designed 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.

Still, the closure of the underground testing site could be a useful precedent for Washington and Seoul as they proceed with the nuclear negotiations with Pyongyang, analysts say.

North Korean leader Kim Jong Un, left, and South Korean President Moon Jae-in pose for photographs after signing a declaration on April 27 in the border village of Panmunjom. Pool / Getty Images

"Now that North Korea has accepted in principle that agreements should be verified, U.S. negotiators should hold them to this standard for any subsequent agreement," said Adam Mount, a senior defense analyst at the Federation of American Scientists. "It will make it more difficult for Kim Jong Un to deny inspections now that he has placed them on the table."

North Korea has invited the outside world to witness the dismantling of its nuclear facilities before. In June 2008, international broadcasters were allowed to air the demolishing of a cooling tower at the Nyongbyon reactor site, a year after the North reached an agreement with the U.S. and four other nations to disable its nuclear facilities in return for an aid package worth about $400 million.

But in September 2008, the North declared that it would resume reprocessing plutonium, complaining that Washington wasn't fulfilling its promise to remove the country from the U.S. list of state sponsors of terrorism.

The administration of George W. Bush removed North Korea from the list in October 2008 after the country agreed to continue disabling its nuclear plant. However, a final attempt by Bush to complete an agreement to fully dismantle North Korea's nuclear weapons program collapsed that December when the North refused to accept U.S.-proposed verification methods.

The North went on to conduct its second nuclear test in May 2009.