Chinese Vice Premier Li Keqiang said that the Japanese government's deal to "purchase" the Diaoyu Islands from the so-called "owner" severely undermines China's territorial sovereignty.
China's top meteorological center on Tuesday began providing weather forecasting for the Diaoyu Islands and their surrounding waters.
The Foreign Affairs Committee of China's National People's Congress issued a statement on Tuesday, voicing its strong indignation toward and condemnation of Japan's "purchase" of the Diaoyu Islands and its affiliated islets.
Japan on Sept 11 appointed Shinichi Nishimiya to replace Uichiro Niwa as its ambassador to China amid escalating tensions over the Diaoyu Islands.
The first Chinese forecast of weather conditions on the Diaoyu Islands and in surrounding waters was broadcast on China Central Television on Sept 11.
The Chinese military expressed strong opposition and protest against the Japanese government decision to "nationalize" China's territorial Diaoyu Islands, the spokesman said.Premier Wen vows no concession
China's statement over Diaoyu Islands
Chinese ships reach waters around Diaoyu Islands China determined to safeguard sovereignty
Chinese people have been angered by the Japanese cabinet's decision to use reserve funds to "purchase" part of China's Diaoyu Islands.
Taiwan's leader, officials and media have strongly protested against Japan's move to "purchase" parts of the Diaoyu Islands.
China's civil patrol ships Tuesday reached the waters around the Diaoyu Islands to start patrolling and showing China's sovereignty over these islands.
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.