(MENAFN- The Arabian Post)

China's expanded export controls on rare-earth materials have jolted global semiconductor supply chains, with firms scrambling to assess vulnerabilities while the United States countered by threatening a sweeping 100 % tariff and new software export curbs.

The Chinese Ministry of Commerce broadened restrictions to 12 elements and extended licensing requirements to include mining, refining and recycling equipment-pressing that any dual-use or defence-tied requests will be denied. Foreign firms using Chinese rare earths or related technology must now also apply for approvals before exporting controlled goods. Enforcement against international entities reflects a striking assertion of long-arm jurisdiction targeting the chip sector.

U. S. supply chains reliant on China's dominant role in processed rare earths are bracing for bottlenecks just as demand for advanced semiconductors tied to AI and defence escalates. Analysts warn that disruptions could raise costs, delay production schedules and prompt a scramble for alternative suppliers.

Responding to Beijing's moves, President Donald Trump vowed to impose a 100 % tariff on Chinese imports-effective November 1 or earlier-and impose export controls on“critical software.” The measures would stack over existing tariffs, escalating a fracture in U. S.–China trade ties.

Markets reacted sharply: the S&P 500 fell 2.7 % and the Nasdaq dropped 3.6 %, the heaviest single-day slumps since April. Tech stocks, particularly those deeply tied to Chinese supply chains, suffered the greatest losses.

In Beijing, authorities moved swiftly into retaliation. The Chinese government opened an antitrust investigation into Qualcomm over an Israeli acquisition and slapped port fees on U. S. ships. Such moves underscore mounting leverage amid escalating tensions.

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Beijing maintains that the export controls are grounded in national security imperatives, aimed at cutting off overseas military or sensitive semiconductor uses. Officials emphasised that the rules apply to Chinese firms globally and curtail cooperation abroad in processing and magnet technologies.

U. S. analysts note that China already dominates over 90 % of processed rare earth outputs used in permanent magnets. That dominance positions Beijing to weaponise supply dependence-a scenario U. S. officials have long cautioned against.

The United States has sought to diversify rare-earth supply through investments in domestic projects. A notable player is MP Materials, whose U. S. facility now produces neodymium and praseodymium metal-critical inputs for NdFeB magnets. But scaling such alternatives amid global demand will require time and capital.

Diplomatic channels remain active. While Trump hinted the planned summit with Xi Jinping might be jeopardised, he has not formally cancelled it. Analysts suggest that both sides retain incentive to negotiate a de-escalation, yet the current standoff may reshape norms around extraterritorial export curbs.

Beyond U. S.–China bilateral effects, European and Asian manufacturers are watching developments closely. Some warn that delays in export licensing will ripple through to industries ranging from electric vehicles to aviation, while trade partners urge restraint.

Within the chip industry, tensions are mounting. Key suppliers of memory, lithography tools, magnets and wafers may face delays or contract renegotiations. Firms are assessing stockpiles, production centres outside China and potential reengineering.

The rare-earth clampdown marks a watershed-Beijing's most aggressive gesture yet to exert control over high-tech supply chains. Its implications for the AI boom, defence industrial bases and global trade architecture are unfolding under high stakes and tight timeframes.

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