Is the ban leaking? Enriched-uranium re-routing after the 2024 US–Russia uranium bans

Trade-flow companion to the price wedge (R72). This case measures the second half of the choke: is the control holding, or is banned material re-entering the buyer through a laundered origin? It is a DUAL-SCORE / alternative-track signal — never folded into any Tier-1 exposure score. The divergence between "who the controlling states say they stopped trading with" and "who suddenly started supplying the US" IS the signal. Research, not investment advice; re-routing is INFERRED from timing, mirror-flow coincidence and public capacity records, never asserted as sanctions-busting on any single shipment.

This is the third entry on the Russia consumer-embargo track (after Russian crude → refined products, and Russian aluminium → China), and it adds a shape the corpus had not yet seen: a transit country with genuine capacity, which defeats the volume-implausibility leg by construction and forces the detector back onto timing + the controlled-origin inbound mirror. It is also the first case carrying an active US government circumvention investigation as corroboration.

Verdict

Two mirror-image bans opened a structural US–Russia decoupling of the nuclear fuel cycle:

• US → Russia (import ban). The Prohibiting Russian Uranium Imports Act

(Public Law 118-50, div. H), signed 13 May 2024, bans US imports of Russian-produced low-enriched uranium (LEU), with DOE case-by-case waivers through 2027 and a hard cutoff in 2028. Russia was the single largest foreign supplier — ~25% of US enrichment (SWU) demand in 2023.

• Russia → US (export ban). Government Resolution No. 1544 (14 Nov 2024)

added HS 2844 20 (enriched uranium) to Annex 2 of Resolution 313, temporarily banning enriched-uranium exports to the US through 31 Dec 2025, with FSTEC one-off licences as the escape valve.

US customs then showed a supplier that had never shipped enriched uranium to the US appear from nowhere — China — exactly as China's imports of Russian enriched uranium hit records:

Sources: China 0-t baseline and shipment sizes — US International Trade Commission (USITC DataWeb) and Chinese Customs, as reported by Bloomberg and S&P Global Commodity Insights (2024). CY2023 ≈175 t — Chinese Customs. Russia Jan–Jul 2024 volume and −30% — USITC via reporting; ~25% US SWU-demand share (2023) — OSW Centre for Eastern Studies (18 Jun 2025), citing EIA. Basis caveat below.

China went from 0 t in 2020, 2021 and 2022 to a multi-hundred-tonne US supplier beginning December 2023 — the month the US import-ban bill cleared the House — and continuing through the May-2024 signing. A supplier that materialises at the exact moment the dominant incumbent is being cut off is the classic entrant-timing tell.

Why the usual volume test does not close it — and what does

The antimony template asks: can the transit country even produce this? For Thailand (antimony) or Indonesia's phantom-ore leg the answer is no, and the surge is self-evidently laundered. Uranium breaks that test. China operates genuine commercial centrifuge enrichment — CNNC at roughly 9 million SWU/yr (~10.5% of world capacity in 2020, growing), and Rosatom + CNNC together hold ~56% of world enrichment (World Nuclear Association; Energy Intelligence). China can enrich uranium. So "a country with ~0% capacity surged" is unavailable here — the volume-implausibility leg is structurally inapplicable.

The signal instead rests on three legs, none of which is the volume test:

1. Entrant timing. Zero US shipments 2020–2022, then a step-change to hundreds of tonnes beginning the exact quarter the import ban advanced. New suppliers to a fuel market that contracts years ahead do not appear overnight by coincidence. 2. The controlled-origin inbound mirror. The same window shows China's imports of Russian enriched uranium surging — "soared in 2022 and 2023," record in 2024, and "hundreds of additional tons" in 2025 vs the prior year, an increase large enough to approach the annual fuel needs of France's entire reactor fleet (Bellona Nuclear Digest, Mar-2026, analyst Dmitry Gorchakov; Chinese Customs + UN Comtrade per OSW). Russia redirected to China what the US would no longer take; China's new US line opened alongside. 3. An active government probe. The US DOE (with Commerce) is investigating whether China is "importing Russian uranium as part of a scheme to export material produced domestically that they would otherwise have used in their own reactors" — a fungibility swap, not molecular relabelling. The Uranium Producers of America and Urenco USA formally asked Commerce to examine the Chinese line as circumvention of the Russian-uranium ban (S&P Global; Mining Weekly, Sep-2024).

The mechanism: a fungibility swap, not a namesake shell

Antimony leaked through a named corporate pipe (Guangxi Youngsun → Thai Unipet → Youngsun & Essen). Uranium does not need one. Enriched uranium is a fungible commodity measured in SWU — one enricher's product is indistinguishable from another's at the same assay. So China need not physically re-ship Russian atoms: it can absorb Russian SWU into its own fuel cycle and release an equal quantity of Chinese-labelled enriched uranium to the US. The molecules that reach the US may be genuinely Chinese; the displaced dependency is Russian. Even a perfect physical audit could not separate the two — this is why the signal can never rise above inference, by the physics of the commodity.

The Rosatom–CNNC relationship deepens the read without being a shell: part of CNNC's capacity — an estimated 1.5 million SWU/yr — runs on Russian-supplied centrifuges (Energy Intelligence; Belfer Center), so Chinese enrichment is itself partly built on Rosatom technology, alongside long-term TENEX–CNNC commercial supply. The "pipe" is a state-commercial fungibility integration, not a namesake front — which is exactly why the common-ownership tell reads N here even though the two national fuel cycles are tightly coupled.

Mode: closest to (C) transformation-washing, but the laundering vector is enrichment fungibility / capacity-swap, not substantial-transformation origin rules. Sits beside the Russian-aluminium diversion shape on the same consumer-embargo track.

Why it matters for the buyer

1. Country-of-origin is doubly compromised for uranium. A US utility reading "no Russian LEU" may still hold Russian-displaced fuel wearing a Chinese label — and a Chinese line that itself carries a fresh dependency the ban was meant to reduce, on a supplier the US separately treats as strategic-rival. 2. The ban is binding — hence the swap. Fungibility routing only pays when the controlled SWU is genuinely scarce and valuable ex-Russia, the same scarcity the Western-source SWU price premium prices. Flow re-routing and the enrichment premium are two readings of one fact: the tap is real. 3. Leading indicator of enforcement risk. The DOE/Commerce probe is where the Chinese leg breaks next; a US buyer contracting "Chinese" enriched uranium today should price the probability that the line is curtailed or re-scrutinised, and that Russia's FSTEC-licence and DOE-waiver channels (both still live into 2025) close on the December renewal cycles.

Method & honesty rails — why GATE 0

• Trade data: HS 2844 20 (uranium enriched in U-235). US import figures from

USITC DataWeb / Chinese Customs via Bloomberg + S&P Global; Russia→China mirror from Chinese Customs + UN Comtrade (OSW charts) and Bellona. No single free primary pull isolates all cells — this case is assembled from named reporting of those datasets, not a committed JSON artifact, and is labelled accordingly.

• Basis caveat: the Dec-2023 single-shipment figure (242,990 kg, USITC) exceeds

the CY2023 full-year Chinese-customs figure (≈175 t), and the "≈124 t in 2024" and "May-2024 shipment 123,894 kg" figures may be the same tonnage under two reporting bases. Import-log timing vs export-basis calendar-year differ; the robust, twice-sourced facts are (a) 0 t before 2023 and (b) hundreds of tonnes across 2023–2024 — enough for the entrant tell, not for a precise monthly series.

• Why GATE 0, structurally: (1) the volume-implausibility leg is inapplicable —

China has real enrichment capacity, so no origin can be called "impossible"; (2) no namesake-shell ownership pipe — the tell is a state-commercial fungibility integration, so the common-ownership flag is N; (3) SWU fungibility makes the molecular link unprovable in principle. This case is nonetheless the best-corroborated GATE 0 in the corpus, carrying an active US DOE/Commerce investigation and formal industry circumvention complaints (UPA, Urenco USA).

• Alternative-track only: never touches buyerRelativeScore or base exposure.
• Inference, not accusation: re-routing is inferred from entrant timing, the

mirror inbound surge and public capacity records. No individual shipment is asserted illegal beyond what the cited public record and the ongoing US investigation state.

New shape for the detector (R72)

Uranium is the first row where the transit country can genuinely produce the controlled material. The two-layer detector's volume leg ("X can't make this") is therefore off the table, and the fingerprint must come entirely from entrant-timing + the controlled-origin inbound mirror + a corroborating official probe, with molecular proof foreclosed by commodity fungibility. Contrast: antimony (zero-capacity relabel, provable-ish) → Russian aluminium (legitimate large buyer, diversion) → uranium (capable transit, fungibility swap). The lesson: when the launderer has real capacity, absence of an implausible volume is not absence of leakage — read the mirror, the calendar, and the enforcement docket instead.