If North Korea is denuclearizing, why is it expanding a nuclear research center?

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North Korea continues to make improvements to a major nuclear facility, raising questions about President Donald Trump's claim that Kim Jong Un has agreed to disarm, independent experts tell NBC News.

New satellite images made public by 38north, a web site devoted to analyzing North Korea, show that "improvements to the infrastructure at North Korea's Yongbyon Nuclear Scientific Research Center are continuing at a rapid pace," three 38north analysts concluded in a paper.

An annotated satellite image shows what the web site 38north says is pipeline connecting new buildings and main production building recently completed at the Radioisotope Production Facility.Airbus Defense and Space and 38 North

The analysts cautioned that the continued work at the Yongbyon facility "should not be seen as having any relationship to North Korea's pledge to denuclearize. The North's nuclear cadre can be expected to proceed with business as usual until specific orders are issued from Pyongyang."

However, other experts argue that ongoing work on the site of a reactor that is producing fuel for nuclear weapons shows that North Korea has no intention of disarming.