Ironically what the U.S produce is the easier to replace for China, as you can read in this thread most of the equipment i post here is mostly from Naura, AMEC , ASM and other, they are producing equipment of ever increasing yield, lower price and higher quality, for very advanced nodes 28nm and lower, China SME companies are growing faster than their US counterpart and their equipment is being integrated seamless in their supply chain, with ASML the hardest to replace, but they will be alternatives. but i think China will be able to make 28nm chips completely independent in a few years.