The ships entered Japan's contiguous zone -- an area up to 24 nautical miles from the country's coast -- Tokyo said, calling the incident "totally unacceptable". China said it had complied with international law.
The territorial waters extend 12 nautical miles. The contiguous zone goes to 24 nautical miles, but the extra 12nm are not territorial waters. A country exercises limited jurisdiction in the contiguous zone.
Last week, China’s Liaoning aircraft carrier sailed between two Japanese islands near Taiwan for the first time, accompanied by two destroyers.
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Now that changes contexts quite a lot, doesn’t it?
Yet China wants to protest being a victim as if this new event just happened in a vacuum.