Chinese Foreign Ministry Spokesperson Hua Chunying told a media briefing here that China's determination and will to safeguard its national sovereignty is unswerving.
Hua's comments came after a Philippine security official said on Wednesday that the country had deployed a fresh batch of marines and supplies to Ren'ai Reef.
China has indisputable sovereignty over the disputed Islands and its surrounding waters, which include Ren'ai Reef, she said.
China's claims that most of the South China Sea belonged to it. Beijing's claim is disputed by the Philippines, Vietnam, Malaysia and Brunei besides Taiwan.
