The report, released Monday by the Center for Strategic and International Studies, said the base is one of approximately 20 undeclared missile operating bases, part of Pyongyang’s ongoing ballistic missile program. Researchers at the center’s Beyond Parallel project said the latest report provides more evidence that North Korea is not dismantling its weapons facilities.

“While diplomacy is critical, and should be the primary way to resolve the North Korean nuclear problem, any future agreement must take account of all of the operational missile base facilities that are a threat to U.S. and South Korean security,” the report said.

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“North Korea is not supposed to have these ballistic missile bases,” said Victor Cha, one of the report’s authors. “And of course they have them and have not disclosed them.”

After President Trump’s historic summit with North Korean leader Kim Jong Un in June, Trump wrote on Twitter that there was “no longer a nuclear threat from North Korea.”

The White House announced Friday that Trump would hold a second summit with Kim next month as the two sides seek to jump-start nuclear talks that have bogged down.

“North Korea basically wants to trade away things they won’t do in the future, or to give up things from the past they don’t need anymore, while not negotiating over things like this, their actual capabilities,” Cha, a former National Security Council official focused on Asian affairs, said in an interview.

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Trump has said his own negotiating skills can bypass stalled talks among lower-level diplomats to strike a deal for North Korea to relinquish a nuclear weapons program that analysts said can now reliably strike the United States.

Experts have said there has been no demonstrable progress since the first summit in Singapore in June. Trump’s claims that North Korea is a diminished threat have been contradicted by the Pentagon and U.S. intelligence agencies. The White House declined to comment.

Of the 20 or so undeclared missile bases, CSIS researchers have been able to locate 13. In November, researchers released a report on the first of the 13 bases; Monday’s report describes the second.

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The Sino-ri base is about 130 miles north of the demilitarized zone, the report said. It served as one of the first bases for the country’s most widely deployed ballistic missile, the Nodong ­medium-range ballistic missile. The base may also have played a role in the development of the country’s newest ballistic missile, first tested or unveiled in February 2017, shortly after Trump was inaugurated.

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The base is most often referred to as a missile operating base. But “it has fulfilled broader missions” as an operational test and development site and training facility subordinate to the “Strategic Force of the Korean People’s Army,” the report said. The KPA Strategic Force is responsible for all ballistic missile tests.