I hope everyone check on the map where Paracel islands are. If not China who claims them, who can? Beside Vietnam. Actually China is closer to the area than Vietnam. All other countries are at least 1,000 miles in the South. So in reality, Vietnam is the only other claimant of Paracel islands (Taiwan's claim is for Republic of China, which is the root cause for PRC as well).
Vietnam's claim is also based on the claim of the French who used to control all of Indochina as a colony. Even the French recognized the sovereignty of Paracel islands belonged to Qing Empire of China in exchange of Qing's recognition of the French control of Indochina. The French went back on their words later.
Either way, the HQ-9 AA missiles placed on Paracel islands has a max range of 200km. Being over 1,000km away, Philippines should have nothing to worry about.
The island where China put missiles and jets on is called Woody island.
On the other hand, Philippines got nothing to fight off the Chinese if a war really break out. A single Chinese 052D destroyer can wipe out the entire Philippines' navy, and they have 3 of those in service, 3 more in sea trial, 6 more under construction. Saying Philippines is ready is a joke. Unless what Philippines meant was "ready to drag the US into the war".
Philippines should not even think about the router for war when it comes to disputes. It is a no win situation. Talk is the only opinion. The US will only act if China is weak like Iraq with no real WMD which China has hundreds.