Sino-Japanese relations are now at their most strained since the resumption of diplomatic ties in 1972, China's think tanks say.
Several Japanese aircraft enter China's Air Defense Identification Zone (ADIZ) over the East China Sea and carried out extensive reconnaissance.
The Japanese government has recently provoked disputes on historical issues and made unprecedented dramatic changes to its security policy, Chinese Foreign Ministry spokesman says.
The Japanese Foreign Ministry releases declassified diplomatic archives regarding the Diaoyu Islands, a move observers say attempts to challenge China's sovereignty over the islands.
The economic and financial cooperation between China and Japan should not be affected by the Diaoyu Islands disputes, experts urged at the ongoing Beijing-Tokyo Forum on Saturday.
Yasushi Akashi, former undersecretary of the United Nations, called for Japan and China to work together in establishing a crisis management system to reduce misunderstanding and bring intense bilateral relations to track
And a donation of 1,500 Chinese books to Japan's Soka University library could be the seed from which a friendship between two cultures grows.
Mutual trust and benefit are key elements to the development of Sino-Japan relations, said Zeng Peiyan, former vice-premier.
Joint effort, cooperation and exchange will plays key roles in developing China-Japan relations, said Wang Chen, minister of the Information Office of the State Council, during the opening ceremony of the Eighth Beijing-Tokyo Forum.
Despite the 40th anniversary of diplomatic relations between Japan and China, China and Japan need to make more efforts to improve relations,according to Tokyo 2020 Council Secretary General Kazuo Ogura, speaking at the eighth Beijing-Tokyo Forum on Sunday.
China and Japan should chose cooperation when facing friction, said Zhao Qizheng, director of the Foreign Affairs Committee of the Chinese People's Political Consultative Conference on Sunday.
China and Japan should work closer together amid the deepening European debt crisis to tackle regional and global economic problems.