Beijing has warned Manila to stop making provocations in the South China Sea, while urging Washington to stop "using Manila" to disrupt peace in the region.

Speaking of the China Coast Guard's recent law enforcement near Tiexian Reef, Foreign Ministry spokeswoman Mao Ning said the Philippine side disregarded China's dissuasion and had its people land on the reef illegally multiple times.

The Philippines seriously violated China's sovereignty and the Declaration on the Conduct of Parties in the South China Sea, Mao said at a regular news conference, adding that the Chinese side's response was "legitimate and lawful".

Two public service boats from the Philippines entered waters near Zhubi and Tiexian reefs on Wednesday without the permission of the Chinese government, the China Coast Guard spokesman Liu Dejun said on Thursday.

People from the Philippines landed on Tiexian Reef, and one of the Philippine ships approached a CCG ship dangerously, leading to scrapes, Liu also said.

The CCG also released a video showing the process.

"Facts speak louder than words," Mao said.

"The Philippine side should immediately stop its provocations that violate China's sovereignty, or China will respond resolutely," Mao said.

The United States Ambassador to the Philippines Marykay Carlson accused China of "aggressive actions" and voiced support for the Philippines in a post on X on Thursday.

In response, Mao said: "We urge the US to stop using the Philippines to stir up troubles in the South China Sea and stop disrupting peace and stability there."