China's Quiet Rare Earth Chokehold: Suppliers Halt US Shipments Amid Geopolitical Fears

Chinese rare-earth suppliers have begun refusing shipments to US customers since early August 2026, driven by fears of Beijing's retaliation following sanctions on the Responsible Business Alliance (RBA), according to multiple industry sources. This development, first detailed in a Reuters exclusive on September 4, underscores the fragility of global critical minerals supply chains as US-China tensions escalate ahead of a planned Xi-Trump summit later in the month.

The Reuters report cites three sources indicating that a handful of Chinese firms have declined to ship rare earths to US companies, wary of punishment for complying with due diligence frameworks like the Responsible Minerals Initiative (RMI), which is linked to the RBA. Other suppliers have preemptively halted US deliveries to avoid geopolitical entanglements, with one source noting four specific instances where material was withheld over resale concerns to banned entities. Exact volumes remain opaque, amplifying Beijing's asymmetric leverage without a formal embargo.

This aligns with a pattern of tightening controls. In June 2026, China added US firms including MP Materials and USA Rare Earth to its export control list in retaliation for US measures, prohibiting dual-use exports and targeting efforts to build domestic supply chains. Earlier restrictions on heavy rare earths like dysprosium, terbium, and yttrium—imposed in 2025—have already slashed shipments to the US, with customs data showing sharp declines or outright halts in key elements vital for defense, semiconductors, aerospace, and magnets.

Broader context reveals sustained pressure: Chinese exports of certain rare earths to the US have lagged global trends post-Busan Accord, with analysts noting divide-and-rule dynamics. Prices for affected materials have surged outside China, while US efforts to diversify (e.g., via domestic mining and allies) face delays. The RBA sanctions, announced August 5, 2026, explicitly bar Chinese entities from transactions with the group, disrupting supply-chain audits and prompting self-censorship among exporters.

Implications extend beyond immediate shortages to long-term decoupling. These materials underpin AI hardware, rearmament, and energy transitions; disruptions force Western firms into costly scrambles for substitutes. With rare earth processing still ~90% China-dominated, the episode highlights how export licensing, entity lists, and informal halts serve as tools of economic statecraft, potentially reshaping global trade ahead of high-stakes diplomacy.