Kim Jong Un on Sunday visited a glass factory once suspected of producing military equipment, a report said days after North Korea announced it tested a “newly developed ultramodern tactical weapon.”

The North Korean despot gave “field guidance” at the Taegwan Glass Factory in Northern Pyongan Province, Yonhap reported, citing North Korea’s Korean Central News Agency. Kim praised the “flawless” glassware and optical instruments while stressing modernized production.

Sunday’s visit to the glass factory was Kim’s first time since 2014. The plant was previously suspected of producing military lens.

On Friday, North Korea announced it tested a mysterious “newly developed ultramodern tactical weapon” that was supervised by Kim.