If you look at the list of fabs https://en.wikipedia.org/wiki/List_of_semiconductor_fabrication_plants https://en.wikipedia.org/wiki/List_of_semiconductor_fabri

If you look at the list of fabs https://en.wikipedia.org/wiki/List_of_semiconductor_fabrication_plants https://en.wikipedia.org/wiki/List_of_semiconductor_fabricat... you'll see that of all the modern fabs, about half of them are in China already. You still got the top 2 in Taiwan and Korea, so they won't be able to produce iPhones or Macbooks. But the rest is there already. Even Samsung has a few fabs in China.