But the freedom of navigation and over-flight in no way means that foreign military vessels or aircraft can violate the international law and disregard the legitimate rights and the safety of over-flight and navigation of other countries, she said.

Hua said China's determination to safeguard national sovereignty and territorial integrity was "as firm as a rock."

She urged the United States to correct its mistake, stay rational and stop irresponsible words and actions.

In response to a question concerning US officials' comments on the code of conduct in the South China Sea (COC), Hua said China and ASEAN countries are fully and effectively implementing the Declaration on the Conduct of Parties in the South China Sea (DOC).

Under this framework, consultations on the COC are progressing steadily and all parties are making efforts to seal the COC based on consensus, she said.

As the United States is not concerned in the South China Sea, it should show full respect for China and ASEAN countries, be discreet with words and actions and create a favorable environment for consultation rather than stir up trouble, Hua said.