"North Korea has already finished developing (the) Baekdu Engine, so there would be no problem running ICBM missile programs even if they close down the Sohae site", Yang said. "They're blowing it up", he said.
The move will only be significant if North Korea takes more than cosmetic steps to fully shutter the site, not just the test stand, said Melissa Hanham, a senior research associate at the James martin Centre for Nonproliferation Studies.
"Obviously, it's the very front end of a process".
He added: "The detailed negotiations have not begun".
Mattis said he was unaware of any steps by North Korea toward denuclearization, and he "wouldn't expect that at this point".
Japanese Chief Cabinet Secretary Yoshihide Suga last week told reporters that the Trump-Kim summit has significantly relieved Japan's security environment, but that the government still plans to go ahead with a plan to install land-based Aegis Ashore missile interceptors.
The United States has identified the test site that President Donald Trump said North Korea promised to destroy.
Almost 7,700 American service members are listed as unaccounted for from the Korean War, of which an estimated 5,300 were lost in North Korea.
The Koreas last held family reunions in 2015 before relations worsened because of North Korea's accelerated pursuit of nuclear long-range missiles and the countering hard-line policies of Seoul's conservative government at the time.
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There was no official confirmation of the return from the relevant USA authorities.
Trump has praised the Singapore meeting as a success.
"There is much demand for group tours for North Korea, because of rising Chinese interest in the North after a series of its summits with China, the US and South Korea".
The South Korean delegation on Friday was led by Park Kyung-seo, head of the Korean Red Cross, and North Korea was led by Pak Yong-il, vice chairman of the Committee for the Peaceful Reunification of the Fatherland.
"With joint efforts of China, the DPRK and related parties, the Korean Peninsula and the Northeast Asia will surely embrace the bright prospects of peace, stability, development and prosperity", Xinhua quoted Xi as saying.
"That's OK. That's OK".
President Donald Trump said North Korea had returned on Wednesday the remains of 200 USA troops missing from the Korean War, although there was no official confirmation of the move from military authorities. Their willingness to keep a hard line on economic sanctions might get impacted by the burgeoning trade war between the U.S. and China, especially since it's targeted at Beijing's CM2025 strategy for dominance in the region.
Trump said on Wednesday the remains of 200 American servicemen had already been sent back, following on from the agreement he reached with Kim in Singapore.
"Our government hopes that the June 12 summit agreements between North Korea and the USA, including the repatriation of US soldier remains, will be implemented swiftly to achieve the goals of completely denuclearizing the Korean Peninsula and establishing a peace regime", the ministry's spokesman Noh Kyu-duk said at a press briefing.