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There have been various supply chain issues since covid started over two years ago, although they have gotten worse as of recently. I agree that markets will eventually adjust and supply chains will originate from elsewhere, although China is also the source of certain materials that is not available elsewhere.
In any event, China likely is going to invade Tiawon during Biden's presidency because it knows that Biden is too weak to respond militarily. They may be waiting to see how the situation in Ukraine plays out.
Yes, it is hard to decouple from China immediately same way it's hard to suddenly stop oil from Russia. It'll take time to bring production back to the US for example.
As for the invasion, that's a possibility. They wouldn't wait for the Republicans to come back to the White House.
It is much easier to transition off oil/gas from Russia than it is to transition off of imports from China. The energy that is imported from Russia is already produced elsewhere throughout the world, and these places just need to increase production. Much of what is imported from China is largely only produced in China, so manufacturing will need to be setup elsewhere.
I think it is probably safe to assume that China (and Russia) has compromising information on Biden, which is why he has been so soft on both countries. I can't see Biden significiently pushing back against China in response to an invasion of Tiawon.