China establishes 'air-defence zone' over East China Sea
http://www.bbc.co.uk/news/world-asia-25062525
"China has demarcated an "air-defence identification zone" over an area of the East China Sea, covering islands that are also claimed by Japan.
China's Defence Ministry said aircraft entering the zone must obey its rules or face "emergency defensive measures"........"
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"...Taiwan, which also claims the Diaoyu/Senkaku islands, expressed regret at the move and promised that the military would take measure to protect national security......"