This undated photo shows a view of Ren'ai Jiao (Ren'ai Reef). (PHOTO / CHINA DAILY)

A Chinese coast guard vessel closely monitored and supervised the entire process of a small Philippine civilian vessel which illegally ran aground on China's Ren'ai Reef in South China Sea and delivered supplies to a stranded military ship on Friday, China Coast Guard said on Saturday.

China unequivocally holds sovereignty over the Nansha Islands, including the Ren'ai Reef and their adjacent waters, it said in a statement.

READ MORE: China says to defend sovereignty, maritime rights on Ren'ai Jiao

Coast Guard said it will continue to carry out law enforcement activities in waters under Chinese jurisdiction, including Ren'ai Reef, in accordance with law.

Despite repeated warnings from China, the Philippines has repeatedly deployed ships seeking to deliver construction materials to the BRP Sierra Madre, a crumbling World War II-era Philippine navy vessel that the country intentionally stranded on China's Ren'ai Reef in 1999.

Such items are banned from being supplied to the stranded vessel under an agreement reached by China and the Philippines in recent years.

Huangyan Dao 

Huangyan Dao is China's inherent territory, which is beyond the limits of Philippine territory, foreign ministry spokesperson Wang Wenbin said earlier on Friday when asked to comment on the Philippine National Security Adviser Eduardo Año's recent remarks regarding Huangyan Dao.

With indisputable sovereignty over the island and its adjacent waters, China exercises sovereignty and jurisdiction over Huangyan Dao in a continuous, peaceful and effective manner, said Wang.

"Huangyan Dao is beyond the limits of Philippine territory.”

It is inconsistent with international law for the Philippines to claim sovereignty over Huangyan Dao on the grounds of its comparative proximity to Philippine territory, or claim sovereign rights and jurisdiction on the grounds that Huangyan Dao is within the Philippine exclusive economic zone, said the spokesperson.

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The South China Sea arbitration is completely a political manipulation by the Philippines in order to gain illegal interests, he stressed.

"The award is illegal, null and void. China does not accept or recognize it, and will never accept any claim or action based on the award. China's sovereignty rights and interests in the South China Sea shall under no circumstances be affected by the illegal award," said Wang.