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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".
The islands, known as Senkaku in Japan and Diaoyu in China, are a source of rising tension between the countries.
In its statement, the Chinese defence ministry said aircraft must report a flight plan, "maintain two-way radio communications", and "respond in a timely and accurate manner" to identification inquiries.
"China's armed forces will adopt defensive emergency measures to respond to aircraft that do not co-operate in the identification or refuse to follow the instructions," said the statement.
Perhaps needless to say, Japan, the United States and every other country in East and Southeast Asia with Pacific Ocean coastline are not impressed.