Reacting to the protests lodged by Japan over the creation of the East China Sea Air Defence Identification Zone, Chinese Defence Ministry spokesman Yang Yujun said Japan's remarks are "utterly groundless and China won't accept them."
He also termed US criticism of the zone as ground less, state-run Xinhua news agency quoted him as saying.
The United States is now raising opposition and blaming China which is totally groundless, Yang said.
"The establishment of the East China Sea Air Defence Identification Zone by the Chinese government is "totally rational and indisputable," he stressed.
According to Yang, 20-plus countries, including the United States, have set up their own air defence identification zones since the 1950s.
US Secretary of State John Kerry strongly criticised the creation of the zone saying that Washington is "deeply concerned" and asked Beijing not to enforce the decision.
"This unilateral action constitutes an attempt to change the status quo in the East China Sea. Escalatory action will only increase tensions in the region and create risks of an incident," he said.
Under the new zone all the foreign aircraft will have to identify themselves while flying over the disputes islands called Diaoyu by China and Senkakus by Japan and inform their flight plans to Beijing in advance.
Yang reiterated that China's move aims to safeguard the country's state sovereignty and territorial and airspace safety and ensure the order for flight.
He said the move is a necessary measure for China to effectively exercise the self-defence right and conforms to the Charter of the United Nations and international laws and practices.
