Beijing has declared an area the size of West Virginia off-limits to civilian vessels, ahead of extensive three-day naval exercises near the coast of North Korea. A similar drill took place in the area at the end of July.
The announcement only said that the drills would last between 6 am on Saturday and 6 pm Tuesday, and would involve "large-scale military operations."
China commissioned 18 ships last year. While it currently only operates one Soviet-made aircraft carrier, trials are ongoing on the second vessel, wholly built in a local shipyard.
According to local analysts, the timing and choice of location for the current exercises is more to do with reasserting China’s regional power than an immediate need to test new hardware.