Infrastructure improvements at the Yongbyon nuclear plant are “continuing at a rapid pace”, according to an analysis by monitoring group 38 North of commercial satellite images taken on 21 June.

The cooling system for the plutonium production reactor has been modified and at least two new non-industrial buildings have been built on the site, possibly for use by visiting officials. A new engineering office building has been completed and construction has continued on support facilities throughout the complex, according to a blog post written by Frank V Pabian, Joseph S Bermudez Jr and Jack Liu…

“Infrastructure improvements continue at Yongbyon,” Jenny Town, managing editor of 38 North, wrote on Twitter. “Underscores reason why an actual deal is necessary, not just a statement of lofty goals.”