North Korean leader Kim Jong Un inspected the country’s newest naval corvette and watched a strategic cruise missile test from the ship, according to state media on Monday, days after warning the U.S. about reconnaissance flights off the east coast.

The report also coincides with the U.S. and South Korea kicking off large-scale joint military drills on Monday. 

According to the Rodong Sinmun, Kim called for “modernizing the arms and equipment of the Navy” during the inspection on the east coast, including “the building of a powerful vessel and the development of ship-based and subsurface weapon systems.”

The North