China's coast guard has moved to Taiwan's Pacific side

The number most investors use for Taiwan risk is the daily count of PLA aircraft from Taiwan’s defence ministry. It arrives every morning and it is easy to chart. It also measures the wrong side of the island.

China coast guard patrol area east of Taiwan 27,100 sq nmi 13 September 2026. Bloomberg calculation, via Taipei TimesSince 1 June, China’s coast guard has run patrols in the waters east of Taiwan, averaging two cutters a month across an area of 27,100 square nautical miles. Taiwan’s Coast Guard Administration says Beijing is trying to “leverage ‘law enforcement patrols’ to establish a new normal for its maritime presence in the waters east of Taiwan”. Ryan Martinson of the US Naval War College says Beijing is using a joint statement by Japan and the Philippines “as a pretext for greatly expanding its presence in these waters.”

Commodity-carrier transits east of Taiwan, June 527 30 June 2026. MarineTraffic data, via Bloomberg (Taipei Times)Commodity-carrier transits through the Taiwan Strait, June 420 30 June 2026. MarineTraffic data, via Bloomberg (Taipei Times)In June those waters carried more commodity traffic than the Strait. Ships carrying oil, gas, iron ore and farm goods made 527 transits east of Taiwan, against 420 through the Taiwan Strait, which is usually the busier route, according to MarineTraffic data cited by Bloomberg. The eastern side is the maritime link to the Philippines and the wider Pacific, and it is where China has chosen to put a law enforcement presence.

Chinese state media said 198 vessels were “inspected” on one five-day voyage in June. Bloomberg’s report notes it is unclear what “inspected” means, and we treat the number as a claim. It still matters as one: it is Beijing describing a right it wants to be seen exercising.

Valtor’s inference Our reading, which is an inference: this does not register in the aircraft counts because it is not military activity. A coast guard patrol is policing, and policing is built to look routine. If it matters for markets, it will be through shipping first. An inspection regime that turns into boardings would reach insurers and charterers well before it reached a defence ministry tally.

What to watch

• A boarding of a non-Chinese merchant ship east of Taiwan, confirmed by Taiwan or the flag state and not only by Chinese state media.
• Patrol frequency above two cutters a month.
• Any insurer quoting an additional premium for routes east of Taiwan. We found none we could source.

The aircraft count tells you how loud Beijing is being. The patrols east of Taiwan tell you what it is trying to make normal, and only the first is on most dashboards.