In April 2025, China's Ministry of Commerce published Announcement No. 18 — seven medium and heavy rare earth elements placed under national-security export licensing, effective immediately, no grandfather period, no diplomatic cushion. Yttrium. Scandium. Dysprosium. Terbium. Samarium. Gadolinium. Lutetium. Beijing didn't announce a ban. It announced a paperwork requirement, which in practice has been indistinguishable from a ban.

Chinese customs data compiled by CSIS and published May 5, 2026 shows what that paperwork requirement actually did: yttrium exports from China to the United States ran at 333 metric tons in the eight months before Announcement No. 18 took effect. In the eight months after, they came in at 17 metric tons. That is a 95% collapse in flow — not from an embargo, not from sanctions, not from a naval blockade. From a licensing queue that Beijing controls and the US cannot appeal.

Two North American firms that coat jet engine turbine blades with yttrium oxide — the compound that keeps the metal from liquefying under extreme heat — have paused production lines. One of them is now turning away smaller clients to conserve what little supply it has for Boeing and Pratt & Whitney. A third firm has stopped selling yttrium oxide products entirely because it has run out. European spot prices for yttrium oxide have climbed from roughly $6 per kilogram before the controls to approximately $270 per kilogram — a 4,400% move. US-facing prices are up roughly 69-fold year over year, per Argus data cited by Reuters in February 2026.

Then there is scandium. The US has zero domestic production of scandium. Every 5G smartphone and base station contains chip components built with it, per Dylan Patel, CEO of SemiAnalysis, who told Reuters that major US semiconductor manufacturers depend on it entirely for the chip processing steps that go into next-generation wireless. US chipmakers have been requesting new scandium export licenses from Chinese authorities for months. The approvals are not coming. They have begun reaching out to Washington for help.

The Trump administration described the May 2026 Beijing summit with Xi Jinping as producing a commitment to "address US concerns regarding supply chain shortages," per the White House factsheet. Semiconductor trade association SEMI confirmed the shortage is ongoing as of June 1. The licenses are still not moving.

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The architecture of the operation is worth understanding, because it was built to be durable. China's export control regime mirrors the US Foreign Direct Product Rule — the mechanism Washington has used for years to cut off China's access to advanced semiconductors by asserting jurisdiction over any product that touches American technology anywhere in its production chain. Beijing has now applied the same logic in reverse: if a foreign company anywhere in the world makes a product that contains Chinese-origin rare earth material — at any stage, down to a 0.1% de minimis threshold — that product falls under Chinese export control authority. A magnet made in Japan with Chinese dysprosium requires a Chinese export license to ship to the United States. The paperwork doesn't care which country did the final assembly.

The seven elements in Announcement No. 18 were chosen with precision. Light rare earths — cerium, lanthanum, neodymium — have alternative processing sources outside China. Medium and heavy rare earths do not. Until 2023, China processed 99% of global heavy rare earth supply. The one facility outside that system, a refinery in Vietnam, has been shut down for over a year due to a tax dispute. China's processing monopoly over the elements in Announcement No. 18 is, for practical purposes, total.

General licenses — the multi-shipment annual permits that allow pre-cleared Chinese exporters to move material without case-by-case review — were issued in December 2025 to three Chinese magnet makers: JL MAG, San Huan, and Yunsheng. The permits cover civilian end-users. Defense contractors and aerospace firms with any military affiliation are explicitly excluded from eligibility. The Aerospace Industries Association told the Commerce Department that yttrium is essential to every advanced jet engine program in the country and that the supply chain currently depends entirely on Chinese imports. The AIA's vice president of international affairs described costs as rising amid growing shortages. That statement was made before the most recent license backlog.

The US response is a construction project. USA Rare Earth finalized a $1.6 billion agreement with the Department of Commerce on June 3, 2026, under the CHIPS Act framework — $277 million in direct grants and up to $1.3 billion in loan capacity to build a mine-to-magnet supply chain in Texas and Oklahoma. Commercial heavy rare earth production from the Round Top deposit in Hudspeth County is targeted for 2028, at the earliest, contingent on capital milestones, permitting, and extraction timelines that have never been attempted at scale outside China. The turbine blade coatings that are rationing now cannot wait until 2028.

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Every commercial aircraft engine currently flying — every Boeing 737, every Airbus A320, every widebody on every international route — depends on yttrium oxide coatings applied to turbine blades at regular maintenance intervals. Those coatings are applied by North American firms that are now rationing their remaining stock. Airlines are already squeezed on spare engine availability; Boeing and Airbus are fighting through a maintenance backlog that goes back to 2022. A yttrium shortage doesn't slow production in some abstract future — it inserts itself into the next scheduled engine overhaul, which for some operators is already overdue.

The semiconductor exposure is more direct and more immediate. Every 5G phone sold in the US — every cell tower, every base station, every upgrade cycle that the carriers are currently pushing — contains components built with scandium. The US has no domestic scandium production, no operational alternative suppliers outside China, and stockpiles that industry sources described to Reuters in February 2026 as measured in months, not years. That was four months ago. The licenses are still not clearing.

The November 2026 expiration of the partial truce is the next hard deadline. If bilateral conditions deteriorate, or if MOFCOM simply allows the clock to run, the October controls come back on top of the April controls that never left — covering an additional five heavy rare earth elements and triggering extraterritorial licensing requirements for foreign-made products that contain any Chinese-origin material. At that point, the paperwork burden on the entire global rare earth supply chain expands significantly, at a moment when the US has no alternative processing infrastructure ready.