BEIJING, Dec. 7 -- The Foreign Affairs Committee of the National People's Congress (NPC) on Saturday said China's top legislature firmly oppose a Japanese resolution on China's East China Sea Air Defense Identification Zone (ADIZ).

The lower house of the Japanese Diet on Friday adopted a resolution urging China to rescind its recent establishment of the East China Sea ADIZ.

The Japanese side has no right to make irresponsible remarks on China's establishment of the ADIZ, a statement of the committee said, stressing that the NPC is resolutely opposed to the Japan's so-called resolution.

China's establishment of the ADIZ is reasonable, legitimate and in line with international law and practice, the statement said.

China has always been firmly opposed to and never recognized Japan's unauthorized action to include the Diaoyu Islands into Japan's so-called air defense identification zone, the statement said.

It reiterated that the Diaoyu Island and its affiliated islets are China's inherent territory since ancient times and China has indisputable sovereignty over the islands.

The root cause of the current tensions in the East China Sea is in Japan, the statement said, urging Japan to cut off all provocative words and deeds and to make concrete efforts for the improvement of China-Japan relations as well as peace of the East China Sea and its airspace.