Many countries, including the US and Japan, use ADIZs as a form of early warning, allowing them to track aircraft approaching their airspace.
Planes entering the area are frequently asked to identify themselves and to maintain radio contact with local authorities. Any aircraft causing concern can trigger the launch of fighter jets, which are scrambled to intercept it.
The draft says the zone would at a minimum cover the Paracels, and could go as wide as the majority of South China Sea, the Asahi said.
Beijing is still deliberating the extent of the zone and considering the timing of an announcement, the paper said.
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