Let me throw in a little fun fact about China and Taiwan.A cry baby is exactly what China appears to be, from my POV, living here anyway. They scream bloody murder when bad things happen to China and Chinese folks but chuckle with glee when it happens to the "west". Over here, it's very much an "us and them" situation.
ON TOPIC; China doesn't seem to realise that as her role on the world stage grows, so too, do her international responsibilities, which includes the SCS because of the international boundaries in that area. BTW, did you know that China "won" the Korean war and also that little "fracas" with Vietnam in 1979? Like all things to do with the SCS, China wins hands down according to folks here and with 1.3 billion folks, all of the same mind, they're going to be kinda hard to beat. Funny thing is, they're indoctrinated with this stuff here, schools are very regimented from an early age and when ALL kids are around 14, they undergo rudimentary military training. Each school has it's military uniformed cadre's and this is the mindset here. Trust me, I know. I've taught in schools all over China for over 5 years now and my missus is Chinese. There's going to be a reckoning one day and if I see it coming, I'm heading back to NZ with my missus, kicking and screaming if I have to.
As for Taiwan, right now in Chinafolks are kicking and screaming about the sale of PAC3's to the island. They tend to forget that China is aiming approx 1500 missiles at Taiwan, or maybe they just don't know...this one is beyond me and I don't dare to get into it. My missus said she'd pick up the meat cleaver to attack or defend the "motherland", so do most others I know....how can you argue with a mindset like that.....even when it comes to the SCS.
As far as the US is concerned, well, I guess they're just going to do what they think serves their interests, allies or not.
The ONLY reason that china doesn't scale a mass Invasion on Taiwan, is that they know that Taiwan has Nuclear Weapons, and they will not hesitate to use them on China, being because Taiwan is like 'the skinny kid in a fight' Taiwan has Nukes and will unleash them all into China, and then China might get Taiwan back, however they will have serious civilian casualties, not only that back many democratic nations well step up to help Taiwan, so there goes NATO to the rescue, In the end China WILL BE SEEN AS THE BAD GUY, which is why they dont want to invade Taiwan.:nono