BBC News - US planes challenge China air zone:
"China set up its "air defence identification zone" on Saturday.
A US colonel said the two planes had followed "normal procedures, which include not filing flight plans, not radioing ahead".
The islands, known as Senkaku in Japan and Diaoyu in China, are a source of rising tension between the two nations.
China is insisting that aircraft entering its air defence zone must obey its rules or face "emergency defensive measures".
"We have conducted operations in the area of the Senkakus," said US Colonel Steve Warren, adding that so far there had been no response from China."
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