China's state media called Friday for "timely countermeasures without hesitation" if Japan violates the country's newly declared air zone, after Beijing sent fighter jets to patrol the area following defiant military overflights by Tokyo.
Japan and South Korea both said Thursday they had disregarded the air defence identification zone (ADIZ) that Beijing declared last weekend, showing a united front after US B-52 bombers also entered the area.
The zone includes disputed islands claimed by China, which knows them as the Diaoyus, but controlled by Japan, which calls them the Senkakus, and Beijing's ADIZ was condemned in Washington, Tokyo, South Korea and elsewhere.
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