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China warplanes in air defence zone

29 November 2013 Last updated at 06:22 GMT

Chinese warplanes have been sent to the controversial air defence identification zone in the East China Sea.

The move follows flights by Japan, South Korea and the US through the area, which was unilaterally declared by China.

The zone includes a groups of islands claimed by China, Japan and Taiwan that have been the source of a long-running dispute between the nations.

Catharina Moh reports.