"I will be the first to let you know if things go bad!" he said.
If any country should be anxious about Kim Jong Un's nuclear weapons, it's South Korea, technically still at war with North Korea and with tens of millions of people in easy range of its arsenal.
Experts said the undeclared sites had always been known to U.S. intelligence agencies but had never been publicly acknowledged by Mr Trump who asserted North Korea was "no longer a nuclear threat" following the June summit.
Military analysts said the existence of these bases is a clear sign Pyongyang is continuing to advance its ballistic missile program amid indications that the so-called denuclearization talks with the U.S.is on the verge of failure.
Adding to recent troubles with denuclearization talks, North Korea has continued to lash out at the US and threatened to resume building up its "nuclear forces".
But an official with knowledge of the North Korean position on denuclearization told me last week that the political power shift in Washington after the midterms only reinforces existing North Korean concerns that Kim's government would be left vulnerable if it agreed to denuclearize upfront, as the United States insists, only to face a politically weakened Trump administration unable to deliver on its promises. But experts argue that the country hasn't made any commitment to dismantle such missile bases yet, so the fact that it would maintain them doesn't in itself represent a breakdown in talks with the U.S.
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"There is a phrase, 'great deception, ' used in articles, but North Korea has never promised to shut down this missile base", said Kim, the South Korean spokesman, referring to one of the facilities, Sakkanmol, mentioned by CSIS. This report by Beyond Parallel just days after North Korea called off a new round of negotiations with Pompeo that had been scheduled for Thursday in NY.
The report says that there are barracks for members of a missile operating unit and facilities to house mobile missile launchers and other equipment.
Secretary of State Mike Pompeo has visited North Korea four times this year in hopes of preparing an agreement, in which the United States could formally declare an end to the 1950-53 Korean War - a longtime goal of the dynastic Kim regime as it seeks to safeguard its survival.
South Korea also earlier played down the study, saying that the sites had been known for years.
Experts say the report highlights the need for a concrete and specific agreement to turn North Korean denuclearization from a wish into a reality. The think tank's research team, led by Joseph S. Bermudez Jr., an analyst of North Korean defense and intelligence affairs, said the site was "one of 13 out of an estimated 20 undeclared North Korean missile operating bases identified" by satellite imagery and reporting.
"The question remains if Kim Jong-un will allow his negotiators to come to the table and actually get down to work", said Mr. Maxwell.
It's true that the North Korean missile program was never included in the Singapore statement signed by both leaders, and would not appear to breach any other agreements signed by Pyongyang. Trump has bragged that the sanctions remain in place as negotiations continue for a nuclear deal.