...Temporarily disable the USA so that it CANNOT interfere with the aims of the Oriental power; then present a wimpy and divided and effete USA with a fait accompli in which same O.P. has annexed all it wishes; then offer a big cease-fire and we could all go back to peace and plenty while O.P. enjoys its ill-gotten gains.
That did not work in 1941. I think that it is very possible that certain places in China would be nuked in return.
If... we respond, I would expect a Chinese Declaration of War with the United States exists within hours.
Expect soon after, North Korea announces its alliance with China and crosses the 38th Parallel.
In this scenario, American carriers would be target #1... our foot on far, as Napoleon called his artillery.
If they are neutralized... game over. Taiwan and South Korea exist no more and Japan is a ripe plum, ready to be picked.
Just another opinion.
Shanghai would go too. Because we know there are docks in Shanghai that can front load tanks on the carrier ships for invasion to Taiwan.
In another thought, I question if this is actually an attempt to garner more funding for obsolete Naval technologies. The reality is that the United States can pound China from bases in South Korea, Japan, the Philippines, and Central Asian states.