The foreign affairs committee of the National People's Congress said China's top legislature firmly oppose a Japanese resolution on the country's East China Sea Air Defence Identification Zone.
The lower house of the Japanese Diet Friday adopted a resolution urging China to rescind its recent establishment of the air defence zone, Xinhua reported.
The Japanese side has no right to make irresponsible remarks on China's establishment of the air defence zone, a statement of the committee said Saturday.
China's establishment of the zone is reasonable, legitimate and in line with international law and practice, the statement said.
China has always been firmly opposed to and never recognised Japan's unauthorised action to include the Diaoyu Islands into Japan's so-called air defence identification zone, the statement added.
The statement said the root cause of the current tensions in the East China Sea is in Japan.