China is actually in a better spot than Russia to detach from the west. They make things, their people can definitely use those things, they rely on the west for cash but not really for things anymore. Russia will trade with them for their energy needs, food, mostly soy beans to feed pigs, is where their most of their challenge lies, but they have plenty of trading partners that are not very influenced by the west for that also.
No it is not. China is the king of cheap low end manufacture. The really high end production machinery tends to come from outside. They are far from independent.
They do get lots of machinery from Germany, they can’t produce it as efficiently, but that doesn’t mean they can’t produce it at all. Don’t assume they don’t have a plan B even if it isn’t as cheap as plan A.