I personally i think they just need China and the Philippines to have a very very short but bloody skirmish.I remember about one of the arc in Romance of the Three Kingdoms book that I read long time ago. When Xiahou Dun came to Xinye country, to attack Liu Bei. And Zhao Zilong runaway from Xiaohao Dun 10.000 force, to ensnare him into a trap has been lay down by Zhuge Liang.
I think US has some kind of bait that waiting for China to eat. So China must be careful here.
Plus, those USS Theodore Roosevelt go to Natuna sea. What purpose are they doing by coming to Indonesian sea like that? I think China must share this information to the internet, specially to Indonesian people. That their sea has been provoked by US Navy. So Indonesian Government don't have any excuse to conceal this information from public. this can cause an uproar to Indonesian internet people.
Who know US has some kind of threat to Indonesian Government without anyone know about, with their gunboat diplomacy.
This could be just enough for Washington and Brussels to put on heavy sanctions and tariffs on China like they did with Russia.