Maritime militia boats are fishing vessels that take orders from a military. One has now been spotted off Taiwan's east coast, for the first time, according to a patrol's findings reported this week.

The east coast is the Pacific side. Chinese pressure on Taiwan has been drawn on the western map, across the strait, where the PLA's aircraft and ships have been logged for years. Our flashpoint map has recorded 60 moves in the Taiwan Strait since September 8, the latest on October 6.

A civilian-flagged hull on the other coast belongs to a different map. It is the water through which American and Japanese forces would arrive in a crisis, and it is where the PLA would want to know who is already there.

The timing matches the exercise calendar. SCMP reported this week that expanded Japan-US military exercises could complicate PLA planning over Taiwan. A militia boat is the cheapest answer to that reporting: it costs a fishing license, and it can sit still without anyone calling it an act of war.

The method is not new. The Philippines flagged this week that the Chinese presence in disputed waters has nearly doubled. Manila learned the pattern first: the hulls arrive as fishermen, stay as a fixture, and the coast guard that answers them gets to choose between ignoring a trespass and treating a fishing boat as a warship.

Taiwan's coast guard now has that choice on a second coastline. A patrol that finds one boat on the east coast will be sent back to count the next.