With all due respect, I think that’s a poor analogy. In the case of China and Taiwan, Taiwan is the continuation of the older nationalist government that was overthrown by Mao’s communist forces in 1949 and fled to Taiwan, rather than a breakaway region. If anything, it’s the CCP that broke away from the nationalist government that was in power, not the other way around. And it was not done by regions on the mainland deciding for themselves to secede but rather by conquest by Mao’s rebel forces.
It’s a solid analogy, the reasons for the breakaway are different but the analogy holds.
The CCP thru a revolution took over China, they view Formosa aka Taiwan as theirs just we view Alaska and Hawaii as ours. We would not tolerate a foreign government arming either breakaway state or if necessary, would use force to unite them back into the USA.
Without direct military force, China reunited Hong Kong back into China after many decades of British rule and traditions, they will do the same thing with Taiwan, if the methods don’t work as they did in Hong Kong, China will use force.
The bigger question is what the USA should do in response if anything, I don’t think many Americans are prepared to fight a war with China over an Island most couldn’t find on a map.