China's civil patrol ships Tuesday reached the waters around the Diaoyu Islands to start patrolling and showing China's sovereignty over these islands.
Japanese Prime Minister Yoshihiko Noda ordered Japan's Self Defense Forces to be fully prepared for any emergency.
The Japanese government has exchanged the official contract on the purchase of Diaoyu Islands with Kurihara family. 
Premier Wen vows no concession
China's statement over Diaoyu Islands
Chinese ships reach waters around Diaoyu Islands China determined to safeguard sovereignty
Chinese Foreign Minister Yang Jiechi on Monday urgently summoned Japanese Ambassador to China Uichiro Niwa for a meeting to lodge solemn representations and strong protest against the Japanese government's illegal "buying" of the Diaoyu Islands.
China's top legislator Wu Bangguo said here Monday that Japan's decision to "buy" the Diaoyu Islands is illegal and invalid.
Japanese government intention to "purchase" Diaoyu Islands constitutes a gross violation of China's sovereignty over its own territory and is highly offensive to the 1.3 billion Chinese people.
In response to the Japanese government's official decision to "purchase" China's Diaoyu Islands, experts warned that the Japan should give second thought to their strategy.
Tokyo is slipping farther away from the right track of China-Japan relations as the Japanese government barges ahead Monday with the farce of buying China's Diaoyu Islands.
The Japanese government has reached an agreement with the family, who claims to own the Diaoyu Islands, to buy the islands.Special: Diaoyu Islands
Beijing warned Tokyo against any further sovereignty infringement, as Tokyo confirmed its final plan to "nationalize" China's Diaoyu Islands.
Hillary Clinton will arrive in China Tuesday for a two-day trip to exchange views on a wide range of issues including reiterating the US position on the Diaoyu Islands.
China's Foreign Ministry said it had already made "solemn representations" as Tokyo wrapped up an illegal survey at the waters off China’s Diaoyu Islands.
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