China extends 24% US tariff suspension, but Section 301 threat clouds trade truce

The two-month extension is tactical stalling, not strategic détente. The retained 10% floor reveals structural decoupling has calcified into institutional architecture — no longer a negotiable lever. Supply-chain impact is immediate: ASML, Lam Research, and Applied Materials face compressed delivery windows at mainland fabs. SMIC and Hua Hong must lock critical lithography and etching orders before Q3. EDA surcharges (Synopsys, Cadence) inflate tape-out costs 3-5%, squeezing smaller fabless margins first. Section 301's real lethality isn't the rate — it's itemization. Once HBM or advanced packaging substrates get individually listed, the disruption effect dwarfs a blanket 24% levy. 12-24 month projection: the extend-tighten pendulum becomes the operating norm. Supply-chain logic pivots from efficiency-optimization to redundancy-optimization. TSMC (Taiwan, China) accelerates its Arizona ramp to hedge policy tail-risk; mainland mature-node (28nm+) domestic substitution crosses 60% by 2026. This is industrial sovereignty repricing, not a trade dispute. The truce is theater; the architecture is permanent.