Diaoyu (by China), Senkaku (by Japan), in the East China Sea. 釣魚島(中), 尖閣諸島(日), 東海

Kyodo, via Reuters
The disputed islands in the East China Sea are called the Diaoyu by China and the Senkaku by Japan. Conflicting claims over the islands have exacerbated tensions between the two countries.
see more
China-Japan Dispute Over Islands Spreads to Cyberspace - 纽约时报中文网 国际纵览
中國政府設立「釣魚島」網站宣示主權
http://cn.nytimes.com/china/20150104/c04island/en-us/

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