This comes after Japanese prime minister Yoshihiko Noda and Philippine president Benigno Aquino agreed on Tuesday to strengthen cooperation between their coast guards and navel forces amid the disputes with China.
China, the Philippines, Vietnam and three other nations are contesting claims over parts of the South China Sea, an area comprised of small inhabitable islands, rocks and reefs, but believed to be rich in oil and gas deposits.
"China's proximate aim, it seems to me, is to limit US freedom of success and erode the credibility of Washington's security guarantees to the East Asian states, including and especially the Philippines," he continued.
In response, the Xinhua news agency quoted the Foreign Ministry spokesperson Hong Lei as saying that "there is absolutely no question about the freedom and safety of navigation in the South China Sea. Countries in and out of the region are beneficiaries".