Iran’s Hormuz Blockade Delivers Dual Shock to Chinese Supply Chains as Section 301 Probes Reopen Trade War Front

Brent crude closed at $103.14 on Friday—its second consecutive session above $100—as Iran’s vow to keep the Strait of Hormuz shut enters its ninth day, disrupting 20% of global oil supply. The S&P 500 fell to 6,632 (−0.6%), the VIX surged 12.6% to 27.29, and the 10-year Treasury yield climbed to 4.285% on renewed inflation fears. For Chinese corporates with global operations, the convergence of an energy shock with a reopened trade war front creates the most challenging cross-border operating environment since 2020.

The energy shock hits China asymmetrically. Approximately 40–50% of China’s seaborne crude imports transit the Strait of Hormuz, and China accounts for 37.7% of all crude flows through the chokepoint—more than any other nation. While increased Russian pipeline volumes (now ~1.8 million b/d, up from 1.2 million in 2025) and 400 million barrels of IEA emergency reserves provide partial buffers, Brent has risen 10% this week alone atop a 27.9% surge the prior week—the sharpest two-week move since COVID. PBoC must now weigh currency defense (USD/CNH at 6.88) against monetary easing to cushion the growth hit.

Simultaneously, new Section 301 trade probes launched March 11 against China target the legal pathway to reimpose tariffs struck down by the Supreme Court in February. Treasury Secretary Bessent has signaled tariff rates will return to prior levels within five months. This comes just two weeks before the Trump-Xi summit in Beijing (March 31–April 2), where deliverables have narrowed to token soybean purchases rather than structural breakthroughs.

Three triggers dominate the next 72 hours: the Fed meeting (Wednesday, hold expected at 3.50–3.75% but Powell’s inflation commentary is pivotal), any Hormuz reopening signals, and China’s response to Section 301. Base case (60%): oil consolidates $95–105 as IEA reserves absorb supply shock; risk scenario (25%): Hormuz closure extends beyond four weeks, pushing Brent toward $120 and triggering RMB depreciation past 7.00. Corporate treasury teams should accelerate energy hedging programs and stress-test supply chains for sustained $100+ oil.