Japan, S.Korea hold joint sea drill in China air zone
This handout picture taken by the Japan Coast Guard on February 4, 2013, shows a Chinese marine surveillance ship (back) alongside a Japan Coast Guard ship near the disputed islets (known as the Senkaku islands in Japan and Diaoyu islands in China)
Japan's Maritime Self Defense force used two warships and a helicopter, while its South Korean counterpart also used several pieces of military equipment for the routine training, a Japanese navy spokesman said.
The Japanese military did not inform China about the use of the helicopter, he added.
"It was conducted within what China said was its ADIZ (air defence identification zone)," he said."The drill had been planned for a long time, since before China's announcement. It was not organised in reaction," he added.
Last month, China declared the new ADIZ over a tranche of the East China Sea, including islands disputed with Japan as well as South Korea's ADIZ.
The two Asian democracies have refused to recognise the Chinese zone, as has the United States.
Beijing said aircraft entering the zone must obey its orders and provide a flight plan to Chinese authorities, or face unspecified "defensive emergency measures".
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