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.