Trump-Xi talks leave chip policies unchanged; US guards AI advantage while China pursues self-reliance

A zero-outcome summit is the loudest signal possible: semiconductor decoupling has calcified from a negotiable variable into a structural constant. On the technology stack, EUV lithography export controls, HBM advanced-packaging restrictions, and CoWoS capacity allocation will continue on their current trajectory. Chinese fabs below 7nm remain locked into DUV multi-patterning brute-force approaches with a hard yield ceiling. On compliance, TSMC (Taiwan, China) and Samsung face dual-track regulatory costs that will not ease with diplomatic thaw—policy freeze is actually the most expensive state, as it blocks 3-to-5-year capex planning. In the competitive arena, NVIDIA and AMD will accelerate architecturally isolated regional-specific product lines; Huawei's Ascend ecosystem enters a 2025-2026 window of functional but not fast enough. 12-to-24-month outlook: China will push mature-node 28nm-plus self-sufficiency past 80%, but Chiplet advanced packaging and EDA toolchains remain hard bottlenecks. Washington will likely layer additional restrictions on HBM3E and next-gen AI accelerators. Bottom line: this is not cold peace—it is hot isolation. Two incompatible technology stacks are diverging at a pace of one to two process generations per year, and the global semiconductor market is splitting into two non-interoperable ecosystems.