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South Korea announces expanded air defence zone

8 December 2013 Last updated at 16:07 GMT

South Korea has announced it is expanding its air defence zone in the waters south of the Peninsula, overlapping a similar zone announced by China.

Both zones now include a submerged rock known to South Korea as Ieodo, and used by the peninsula nation as the perch for a maritime research station.

Lucy Williamson reports from Seoul.

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