The only one that can and probably is willing to provide US help to a significant degree is Japan. Despite the confidence level of nut cases in Australian military, they simply don't have the means to really help US.
So, if we do get to a war scenario, then the two possibilities are US intervening early on and US not prepositioned to intervene.
If America already has all of its forces positioned in a war to allow for intervening from the onset of the war, then it doesn't make sense to mount landing of Taiwan itself, since that would just take resources away from the main fight. They can just take Penghu island, put artillery on there and the goal would be to keep Taiwan from assisting US. Keep Taiwanese bases unusable throughout the conflict. I'd assume if they can beat back American forces, then Taiwanese government would just surrender.
If America is not prepositioned to intervene in any significant way, then China would need sufficient force to be able to defeat Taiwan quickly before America can intervene.
For the former, you dissuade US "allies" by making sure that your missiles can very quickly hit those bases. My guess is that only Japan will offer their bases an help America in significant way.
Brave of you to think America will make a clear and decisive decision. Especially early on.
I think it far more likely that the US initial response will be to gather its forces while talking a lot but doing nothing overtly hostile against China.
That not only fits with how modern American leaders lead from the back and defer important decisions as long as possible; it also makes good strategic sense as a means of increasing their likelihood of victory while also putting significant time pressure on China hoping to make China rush and make mistakes and take needlessly heavy losses in its hast.
Then, depending on how the fight goes down, America will ultimately make its big decision on whether to fight or not.
On Chinese strategy, firstly, I don’t think China will so cheaply give up the initiative to dance to America’s tune, as would be the case if they adopted their battle plan based on how America reacts. Instead I think China will try to steer America’s decision with its own actions and performance on the battlefield.
Secondly, while Penghu will undoubtedly be taken and taken early on, I don’t think the PLA will have significant plans for using it as a springboard for the main landings.
As the Russians have so recently and pointedly demonstrated, it’s terrible practice to make complicated, multi-axis/directional battle plans that are sequentially dependant on earlier steps all going according to plan to come together. As would be the case with wanting to make Penghu into an artillery park/logistics hub for the main landings.
I don’t expect PLA initial battle plans for Penghu to go much beyond taking out defenders and securing it with troops, most of which may well pull straight out once they have made the place safe.
They may well land artillery and set up logistics on the island later, but only as an afterthought and probably only if the initial fight isn’t going according to plan and they need more dakka to finish the job.
This is because the amphibious assault and transport capacity needed to make Penghu into an artillery park and keep it supplied so it can actually perform that role will be directly competing with the resources needed for the main landings.
What more, setting up artillery on Penghu will also put that artillery within range of ROC artillery for counter battery fire. The size of Penghu will also limit the mobility of your own artillery and make it more likely for the PLA to take needless losses there.
Depends on how much it gets attacked and how much resource they devote to defend it. Aside from being able to put Taiwan inside of the standard artillery range, there is some value from just having another military base that US military would need to attack due to its closeness to the battle area.
It's not any closer to Ryuku island chain than southeast coastal part of China. So it doesn't provide any additional value from that point of view. I think taking Penghu would be a logical first step along with cutting communication, dealing huge damages to Taiwan's military infrastructure. At while point, you can put artillery on there. That along with drones might be able to allow PLAAF to save a lot of PGMs and cruise missiles that they'd want to use against further away targets. The Russians have shown that with drones, you can do a lot of damge through artillery. And China would have more advanced UCAVs that it can be used to both attack and provide ISR to its artillery units.
The PLA should not be attempting this without many times the number of PGMs and missiles as their worst estimates show as needed.
While one should not be wasteful with expensive air dropped PGMs and missiles, saving a buck should be the very last thing any military commander is thinking about in wartime combat scenarios.