So you don't think NATO involvement would significantly affect the outcome? That's interesting, a lot of citizens of NATO countries seem to think otherwise. I think they're probably wrong because I think NATO is mostly about where the US can put its military and it wins or loses based on US performance, but I'm interested in what Patchwork thinks because I know I have biases of my own. That's why I asked him.
I know you wanted Patchwork's thoughts, but I found idea too absurd to not respond to.
One of the biggest advantages China has in such scenario is Taiwan island's proximity to the mainland and the sheer volume of fire it can generate as a result. The US, for all it's lumbering size, cannot transport anywhere near the amount of fire needed to meaningfully contest China in this region. This is despite the US having significant logistical capability and regional bases. The rest of NATO has a significantly smaller blue-water navy and is even further away from the region than the US. Due to the distances involved, they're basically not going to be able to resupply after their first launch. The tiny amount of ships they can muster as well as the lack of resupply means their fires generation is truly pitiful. So exactly what effect are they going to have?
Let's pretend NATO ships are going from Antwerpen straight to Kaohsiung. That's a 11000+ nm journey and even sprinting at 25 kts for the entire duration, they will be spending at least 18 days in transit. And this is assuming no sea lane closures, never stopping for resupplying/refueling, and the ships are immediately available to be redeployed. In the meantime Taiwan will be basically under total air and sea blockade and starving. If the NATO ships opt to form up with the USN before entering the combat region, then that will take even longer! At that point, maybe we're talking a maybe a month before NATO can even try to fire in anger.
It'll be a similar story for NATO airforce too. What air route are they taking that will get them into the region? How will they be able to get the requisite maintenance and fueling to enter the fray? Distances involved means they will probably need refueling tankers once they take off from an airbase. Yet the few airfields/tankers available will already be in high demand with the USAF and being degraded constantly.
To see how absurd it all sounds, flip the script. Let's pretend Corisca-Sardinia declares independence. Assume the EU has a military the size of the US and decides to invade the island in response. Would Chinese involvement significantly change the outcome? Not unless the EU is committed to actually shooting itself in the face the entire war.
It seems quite self-evident but maybe I'm completely off base and Patchwork will correct me.