Satellite images from last week show that North Korea is making numerous improvements to the infrastructure at a nuclear research facility, according to a new study.

The images, obtained by North Korea analysis outlet 38 North, come just weeks after President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and North Korean leader Kim Jong Un signed an agreement that called for a denuclearized Korean Peninsula.

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The satellite photos indicate that North Korea is quickly progressing on several adjustments to the Yongbyon Nuclear Scientific Research Center.

The improvements include a new cooling water pump house, multiple new buildings, completed construction on a cooling water reservoir and an apparently active radiochemical laboratory. It is unclear whether the reactor is still in operation, the report said.

38 North notes that North Korean nuclear officials are expected to proceed with “business as usual” until Kim orders official changes to procedure.

The agreement between Trump and Kim, signed at the historic summit in Singapore earlier this month, commits the U.S. to “security guarantees” in exchange for a denuclearized Korean Peninsula. Critics said that the deal was unspecific and gave too much to North Korea without securing anything for the U.S. in return.

Ahead of the meeting between the two leaders, North Korea claimed to have destroyed its Punggye-ri nuclear testing site.