Firstly, I don't agree that China should escalate to a nuclear war even if China attempted to invade Taiwan ended up in a failure. China has a no first use policy for nuke and I do believe China would stick to this policy.
Secondly, if the Western powers intervened in the war, then a nuclear exchange would never be ruled out. China is a nuclear power. It is building up its nuclear arsenal. When countries with nukes fighting each others, nothing is going to be ruled out.
Thirdly, you assumed that the Western powers intervention would prevail. That's your opinion. Many people don't agree with you. So don't project your own thinking to other posters.
Fourthly, a member said that China should use nukes when the invasion failed. That's his opinion. I don't agree. However, I would point out China war doctrine is different than the West. China no first use policy has made that the use of nuke almost impossible for the military high command. Therefore, the military high command has developed a new war doctrine. That's China has a ballistic arsenal that can bring destruction to the enemies even greater scale through simply firing a few ballistic missiles pack with multiple tons of explosive to create the kinds of destruction that rival and exceed nukes.
Lastly, the war of reunification was the up most important to the CPC and the Chinese military and mainland Chinese. If the Western powers think that they could provoke China and induce Taiwan independent and get away with it. Then I would advise the West to seriously think the consequence and the fallout of a total war.
