Japan calls China Coast Guard's Yonaguni EEZ claim 'unacceptable' after bombers circle southern islands

Summary

China sent coast guard vessels into waters Japan considers its exclusive economic zone south of Yonaguni Island, the westernmost inhabited island in Japan, sitting 110 km from Taiwan's coast. Japan's Chief Cabinet Secretary declared the patrols and Beijing's maritime claims there "unacceptable", lodging a formal diplomatic protest. China's Foreign Ministry held that the area falls within its continental shelf rights east of Taiwan, calling the patrols legitimate law enforcement. The incident came days after Japan scrambled fighter jets in response to Chinese and Russian bomber flights over Japan's southern islands, a separate but linked pressure campaign. Japan and the Philippines had recently agreed to begin maritime delimitation talks in waters overlapping Beijing's claimed zone, a move that appears to have accelerated Chinese coast guard activity.

Why it matters

Yonaguni sits at the convergence of three pressure points: the East China Sea territorial dispute, the Taiwan Strait, and Japan's southwest island chain, which hosts US Marine forces. China's assertion of coast guard jurisdiction there challenges Japan's legal framework for its own EEZ, sets a precedent for other disputed waters, and tests whether Tokyo can coordinate a unified response with Washington and Manila while simultaneously managing the fallout from the dual-use blacklist.

What to watch

• Whether Japanese or US naval vessels are dispatched to shadow the Chinese coast guard ships.
• The Japan-Philippines delimitation talks, whose first session could trigger further Chinese coast guard responses.
• Whether China expands the Yonaguni patrols to coincide with any Taiwan Strait exercise.