FONOP can only help the US and no other country and that only if China were to be intimidated which is not the case.
The original claims against which the freedom of the seas concept was developed were those of Spain and Portugal over all non-European waters, as an extension of the Treaty of Tordesillas, Grotius thesis on the Mare Liberum of 1609 - which was paid for by the Dutch United East Indies Company - and the claim of England over all the fish in the North Sea which led to the first English Dutch War in the middle of the 17th century. US became owners of the Pacific as a result of defeating the Japanese navy and air force and was free to interpret the concept in their own interest. Now that they are only part owner the concept is changing again. IF the US conception of the Free Sea was these same now as it was in the '40's they would have objected then against China claiming these islands and rocks instead of supporting that claim. They are now trying to maintain a claim of their own somewhat similar to the English claim over the North Sea fish long ago and make themselves ridiculous.
The original claims against which the freedom of the seas concept was developed were those of Spain and Portugal over all non-European waters, as an extension of the Treaty of Tordesillas, Grotius thesis on the Mare Liberum of 1609 - which was paid for by the Dutch United East Indies Company - and the claim of England over all the fish in the North Sea which led to the first English Dutch War in the middle of the 17th century. US became owners of the Pacific as a result of defeating the Japanese navy and air force and was free to interpret the concept in their own interest. Now that they are only part owner the concept is changing again. IF the US conception of the Free Sea was these same now as it was in the '40's they would have objected then against China claiming these islands and rocks instead of supporting that claim. They are now trying to maintain a claim of their own somewhat similar to the English claim over the North Sea fish long ago and make themselves ridiculous.