Huawei is proving US chip controls work better as a slowdown than a stop

Huawei has reached 7nm domestic production via SMIC using advanced DUV multi-patterning, and DeepSeek's R1 model delivers competitive reasoning performance at significantly lower compute cost than Western equivalents, which together answer the question about whether chip export controls are working: they are, partially, and that partial success may be generating a more dangerous response than total failure would have. Constraining hardware access has pushed Chinese AI firms toward algorithmic efficiency gains rather than brute-force scaling, and a system that achieves near-parity performance with a fraction of the chips is more resilient to further supply-side pressure, not less. The US currently holds roughly 75% of cumulative leading AI compute versus China's 15%, per analysis cited by the FAI, but that gap is less useful if the marginal chip matters less. The proposed MATCH Act would extend controls to DUV immersion lithography and post-sale servicing of Chinese fabs, which would tighten the vice, but the window for that to be decisive is narrowing as Chinese domestic tooling matures. For UK companies with China supply-chain exposure in semiconductors or AI hardware, the practical implication is that the dual-track risk, strong US controls now versus potential Chinese resurgence in three to five years, is no longer a theoretical scenario.