China Patrols South China Sea Amid Philippine Tensions
China’s Southern Theater Command (STC) conducted a routine air and naval patrol in the South China Sea from August 21 to 25, announcing the operation on Wednesday while criticizing the Philippines for organizing “so-called joint patrols” with countries outside the region. The statement, issued by STC spokesperson Senior Captain Zhai Shichen, said the patrol was part of regular People’s Liberation Army (PLA) operations to maintain regional security and stability, according to Xinhua News Agency.
“In an attempt to stir up troubles in the South China Sea, the Philippines co-opted countries outside the region to conduct so-called joint patrols, disrupting peace and stability in the region,” Zhai said. “Forces of the STC will resolutely safeguard China’s territorial sovereignty and maritime rights and interests, and firmly uphold regional peace and stability.”
A Recurring Pattern of Patrols
The August patrol marks at least the sixth routine operation conducted by the Southern Theater Command in the South China Sea this year, following similar deployments in January, February, April, June, and July. Each patrol has coincided with Philippine-organized maritime cooperation activities with external partners, including the United States, Japan, and Australia.
In late July, the Philippines, the US, and Japan concluded the 17th Multilateral Maritime Cooperative Activity, a five-day exercise involving the Philippine frigate BRP Antonio Luna, the US littoral combat ship USS Santa Barbara, and the Japanese destroyer JS Yuudachi. As Global Times reported, the drills included communication exercises, replenishment-at-sea operations, and division tactics.
Philippine Aircraft Incident at Huangyan Dao
The latest patrol announcement follows a separate incident on August 21, when three Philippine aircraft—an Islander, a C-208, and a PA-31T—illegally entered China’s territorial airspace over Huangyan Dao (Scarborough Shoal) without government approval. PLA naval and air forces tracked, monitored, and issued verbal warnings to the aircraft, according to Global Times, which quoted STC Air Force spokesperson Senior Colonel Li Jianjian.
“The acts of the Philippine side seriously violate China’s sovereignty, and are highly likely to cause misunderstanding and miscalculation,” Li said. “We sternly warn the Philippine side to stop rights-violation and provocative acts immediately.”
The aircraft incursion was the latest in a series of confrontations around Huangyan Dao, which China seized effective control of in 2012. In late July, the Philippines notified the United Nations of its claimed “baselines and maritime zones” surrounding the shoal—a move China’s Foreign Ministry declared “illegal, null and void” on July 31. On August 1, the PLA Southern Theater Command and the China Coast Guard conducted coordinated patrols around Huangyan Dao, including a joint naval-air training exercise.
Escalating Regional Dynamics
The patrols come amid an increased US military presence in the region. The USS George Washington Carrier Strike Group entered the South China Sea in late July, and the US Embassy in the Philippines has made provocative statements about freedom of navigation. According to the Institute for the Study of War, the PRC continues to assert sovereignty over the Scarborough Shoal, and the August 21 aircraft incident was part of this broader pattern of assertion.
Chinese analysts have framed the Philippine actions as deliberate provocations. Ding Duo, director of the Research Center for International and Regional Issues at the National Institute for South China Sea Studies, called the Philippines’ aircraft incursion another “stunt,” noting that “China has exercised considerable restraint over the Huangyan Dao, but the Philippines should not mistake that restraint for weakness.”
Yang Xiao, a research professor at the Institute of Peaceful Development under the Chinese Academy of Social Sciences, said the continuation of such exercises “represents a dangerous departure from the proper course of China-Philippines relations.” By “repeatedly provoking confrontations and creating instability, the Philippine military is seeking opportunities to expand its forces and authority, increase military spending and obtain more external military assistance,” Yang said.
Diplomatic Channels Remain Open
Despite escalating military tensions, diplomatic channels remain open. Philippine President Ferdinand Marcos Jr. met with Chinese Ambassador Jing Quan in late July, expressing a desire to “reset” bilateral relations. Ambassador Jing emphasized that the Philippines should translate its stated desire for improved relations into concrete actions, rather than allowing external forces to continue destabilizing the region.
Chinese state media, including Lianhe Zaobao, have reported that PLA forces maintained full tracking and surveillance of Philippine joint patrol activities, with the situation “fully under control.”
What to Watch For
The recurring cycle of Chinese patrols and Philippine joint exercises shows no signs of abating. As the US, Japan, and Australia continue to expand their maritime cooperation with the Philippines, Beijing’s response will likely remain calibrated but firm. The Huangyan Dao dispute, in particular, remains a flashpoint where both sides have demonstrated willingness to escalate—and where the risk of miscalculation is ever-present.
Observers will be watching whether the Philippines follows through on its stated desire to reset relations with China, and whether the US carrier presence in the region continues to expand. For now, the Southern Theater Command’s message is clear: China will continue its patrols and will not yield on what it considers its sovereign rights in the South China Sea.