Satellite images show North Korea upgrading nuclear facility

CNN: New satellite images show North Korea has made rapid improvements to the infrastructure at its Yongbyon Nuclear Scientific Research Center -- a facility used to produce weapons-grade fissile material, according to an analysis published by 38 North, a prominent North Korea monitoring group.

Captured on June 21, the photos reveal modifications to the site's plutonium production reactor and the construction of several support facilities -- long-planned upgrades that were already underway before North Korean leader Kim Jong Un and US President Donald Trump met in Singapore earlier this month.

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