U.S. intelligence agencies believe that North Korea has increased its production of fuel for nuclear weapons at multiple secret sites in recent months — and that Kim Jong Un may try to hide those facilities as he seeks more concessions in nuclear talks with the Trump administration, U.S. officials told NBC News.

The intelligence assessment, which has not previously been reported, seems to counter the sentiments expressed by President Donald Trump, who tweeted after his historic June 12 summit with Kim that “there was no longer a nuclear threat from North Korea.”

Analysts at the CIA and other intelligence agencies don’t see it that way, according to more than a dozen American officials who are familiar with their assessments and spoke on the condition of anonymity. They see a regime positioning itself to extract every concession it can from the Trump administration — while clinging to nuclear weapons it believes are essential to survival.