Transcript for North Korea offering access to the nuclear site's demolition

Let's head overseas now to a new move by North Korea, ahead of that high stakes summit with the United States. The government announcing they will dismantle its main nuclear test site in a public ceremony. Tonight, president trump called it a gracious gesture. ABC's Jennifer Eccleston from London. Reporter: Tonight, north Korea setting the stage to demolish this nuclear test site, punggye-ri, hidden inside a mountain and home to the atomic blasts that threatened peace on the Korean peninsula. The north Korean foreign ministry saying it will dismantle the facility later this month using explosives in its tunnels. To quote, "Ensure transparency" that it's ending Tes that move prompting a tweet tonight from the president, calling it "A very smart and gracious gesture." That gesture, a confidence-building move north Korean leader Kim Jong-un first proposed with his south Korean counterpart during landmark talks in April. The declaration coming hours after secretary of state Mike Pompeo revealed new potential incentives to the north. American aid to Pyongyang's battered economy if it gets rid of its nukes. Secretary Pompeo back in Washington, after face-to-face talks with president Kim earlier this week, securing the release of these three American prisoners and finalizing details of the historic June summit with president trump in Singapore. Tonight, North Korea offering access to the nuclear site's demolition, sending a rare invitation to the international press, including Americans. Tom? Jennifer Eccleston for us. And North Korea, a hot topic on "This week" tomorrow morning. Martha Raddatz going one-on-one with the president's new national security adviser, John Bolton.

This transcript has been automatically generated and may not be 100% accurate.