During his visit to the Philippines Saturday, Scott Swift, newly appointed US commander of the Pacific Fleet, joined a surveillance mission on board a P-8A Poseidon plane to observe the aircraft's full range of capabilities in the South China Sea. The US Navy released photos of Swift taking a bird's eye view of the South China Sea, but did not mention if the aircraft had flown over disputed areas.

The Philippine side soon welcomed Swift's move, believing it was a gesture from its US ally to aid its claims to the disputed territories with China.

Swift must have felt that he was the overlord of the South China Sea, as he merely flew over the area but the flight got various interpretations from the Philippine side and regional observers. Washington is an external player that can only exert limited influence to strike a balance over the South China Sea issue. That the US could extend its authority by "inspecting" the South China Sea would only be the illusion of a small number of Americans and Filipinos.

We have noticed that the US Navy has kept much lower key than two months ago when it released details that its reconnaissance plane had approached the Chinese islands under construction. It is estimated that the US will not behave inappropriately in the South China Sea before the meeting of the US and Chinese heads of states in September. But in the long run, its competition with China in the area is unavoidable.

China is accustomed to the frequent petty actions of the US in the South China Sea and is getting itself ready for the troubles stirred up by the US there. China is also improving its abilities in coping with the issue as well.

Most observers hold that while the US wants to strengthen the allies' trust, it does not have the excuse and determination to square off with China. Hence the contradictory and chaotic messages it conveys. Most importantly, Washington does not admit the facts. China has exercised much restraint in the South China Sea and its land reclamation does not violate international law, leaving others no excuse to prevent the move. But the US puts on a posture of involvement while it can unlikely take any substantial action, putting itself in an awkward position.

Manila is even worse. How can it be possible that the Philippines' disputes with China are resolved by the US? Does Manila think that China would acknowledge its unreasonable territorial claims after Swift's flight or if the US sends more navy ships? It would be overly simplistic if Manila thinks this way.

Recently a fictional post circulating on Chinese social media reflects the mentality of the Chinese public that China will not start up conflicts with the Philippines. But if Manila oversteps the red line for any reason, Beijing will strike back regardless of Washington's attitude.

It is understandable that the US hopes to maintain its clout in the area and the Philippines wants to counter China by roping in the US. But they need to mind the boundaries. The Philippines needs to be cautious in the area, as China has been.