China has extensive fab capacity down to 28nm and in-country access to processes as low as 16nm. That puts them roughly where we were in 2011. They also have market access to 10nm and will likely have market access to 3nm before the US has in-country access to it. Furthermore, the actual location of those advanced fabs are all in SE Asia, particularly Taiwan and South Korea. Tech transfer is inevitable, market access will continue to exist in peacetime, and in the event of any conflict they will simply take what they want. Meanwhile, the US is basically stalled around 7nm and has been for quite some time.

Taken together that means that we have at most an 8 year lead on what is in play literally right now in china. Given their investment level it's pretty likely that they will hit parity within two years. And Huawei was first to market with a 7nm CPU design. This is what you term a "secure long-term advantage"?