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Defence12 July 2026 · Analysis

Fentanyl: the Undeclared Chemical Weapon of the US-China War

ACAxel Coudassot-Berducou · 13 min read
This is the English edition. The full, continuously updated analysis is published in French.Lire en français →

Around 75,000 synthetic-opioid overdose deaths a year in the United States, chemical precursors mostly from China, Mexican labs and a supply chain that eludes the classic instruments of national security. Analysis of a file where public health, organised crime and great-power rivalry blur into one.

MISE À JOUR2026-07-12
Overdose deaths in the United States have been falling from their peak, driven by the mass distribution of naloxone and shifts in local markets, but remain at a historically high level. Washington maintains pressure on Beijing for effective control of precursors, the fentanyl file staying explicitly tied to the Sino-American tariff negotiations. Mexico continues operations against the clandestine labs of Sinaloa and Michoacan.

Introduction

Fentanyl is a synthetic opioid roughly fifty times more powerful than heroin. A few milligrams are enough to cause respiratory arrest. This extreme potency is precisely what makes it a logistical nightmare for the authorities: a tiny volume represents a massive number of doses, which makes physical interception almost inoperative.

It has caused in the United States the most severe mortality crisis attributable to a substance in a century. The peak exceeded 110,000 overdose deaths across all substances in a rolling year, of which about 70% were tied to synthetic opioids. That is more than the American dead in Vietnam, every single year.

To treat this subject as a criminal news item is an analytical error. It is a national-security file, a lever in trade negotiations and a textbook case of undeclared asymmetric warfare.


The Value Chain

LinkActorLocation
Chemical precursorsChemical and pharmaceutical industryMainly China, India developing
SynthesisCartels (Sinaloa, Jalisco Nueva Generacion)Mexico
TransportCriminal networks, individual mulesSouthern US border, official points of entry
DistributionLocal networks, online salesUnited States, Canada
PaymentCryptocurrencies, trade-based launderingInternational circuits
A key point often misunderstood: most seizures take place at official points of entry, carried by American citizens, and not between border posts. This invalidates part of the political discourse about the wall and irregular migration as a response to fentanyl.


Why It is a Strategic File

The Asymmetry of Cost

Producing fentanyl costs a fraction of its resale value. The precursors are chemicals with a largely legal use, made by a gigantic Chinese chemical industry that is hard to control exhaustively. A substance with a negligible production cost produces tens of thousands of deaths and hundreds of billions of dollars in annual social costs in the target country. No conventional weapon offers such a ratio.

The Attribution Problem

This is the heart of the file. There is no public proof of a Chinese state policy aimed at exporting fentanyl to the United States. What is documented is an insufficient and intermittent control of precursors by the Chinese authorities, with periods of increased cooperation followed by relaxations coinciding with bilateral tensions.

This ambiguity is the very definition of the grey zone: enough plausible deniability to avoid escalation, enough correlation to feed suspicion. It is analytically sounder to speak of a diplomatic lever than of a deliberate chemical war, but the strategic effect is comparable.

Mutual Blackmail

Beijing has explicitly linked cooperation on precursors to other files: tariffs, semiconductor export controls, Taiwan. Fentanyl has become bargaining currency in a wider negotiation. That is what turns it from a public-health problem into an instrument of foreign policy.


The Mexican cartels, mainly Sinaloa and Jalisco Nueva Generacion, handle synthesis and distribution. Fentanyl has transformed their economic model: unlike cocaine or heroin, it depends on no agricultural crop, and therefore on no agricultural territory to control. A clandestine lab fits in a shed.

This dematerialisation reduces the cartels' vulnerability to classic eradication and increases their margin. It also explains the violent fragmentation observed in Mexico: the barrier to entry has collapsed.

The designation of several cartels as foreign terrorist organisations by Washington has opened a major legal and diplomatic debate on the possibility of unilateral strikes on Mexican territory, a hypothesis that Mexico categorically rejects in the name of its sovereignty.


What Actually Reduced Mortality

An important point for the analysis: the recent fall in deaths is not primarily attributable to prohibition. The factors identified by epidemiologists are:

The mass distribution of naloxone, an antidote that can be administered by a third party, now sold over the counter in the United States.

Test strips, allowing users to detect the presence of fentanyl in other substances.

The evolution of the market itself, with less lethal dosages and the appearance of other substances.

A tragic cohort effect: part of the most exposed population has already died.

This hierarchy of causes has a direct political consequence: harm-reduction policies produced measurable results where prohibition alone had produced none.


DEBATE: Is Fentanyl a Chinese Weapon of War?

Thesis

Yes, in fact if not in intent It matters little whether or not a written directive exists. A state that has the means to control its chemical exports, that demonstrates this intermittently when it serves its diplomatic interests, and that relaxes this control when relations deteriorate, exercises in fact a strategic lever. The result, tens of thousands of deaths a year in the rival country, is that of a weapon.

Antithesis

No, it is first an American public-health crisis The demand is American and its origin is domestic: the opioid crisis began with a mass over-prescription of painkillers by the American pharmaceutical industry itself. Attributing responsibility to Beijing allows a national health and regulatory failure to be externalised. China produces precursors because it is the world's leading chemical industry, not out of strategy. Without demand, no market.

Synthesis

The two readings are partly correct and complement each other. The origin of the crisis is American and pharmaceutical; its current perpetuation depends on an international supply chain that Beijing could disrupt further and chooses not to disrupt fully. Responsibility for the demand does not cancel responsibility for the supply. Analytically, fentanyl is less a deliberate weapon than an available lever, which, in international relations, produces neighbouring effects.


SCENARIOS 2026-2030

Scenario 1: Transactional cooperation (probability: 45%) Beijing tightens precursor control in exchange for trade concessions. Flows shift partly towards India and Southeast Asia. A real but partial improvement.

Scenario 2: Degraded status quo (probability: 35%) Intermittent cooperation indexed to the state of bilateral relations. Mortality stabilised at a high level by harm-reduction policies.

Scenario 3: Escalation (probability: 20%) Unilateral American military action against labs in Mexico. A major diplomatic crisis with Mexico, with no lasting effect on supply.


ANALYTICAL CONCLUSION

Fentanyl illustrates the difficulty states face in dealing with threats that fit no institutional category. It is neither a war, nor an epidemic, nor a simple criminal problem: it is all three. The instruments of national security (interception, sanctions, deterrence) prove inoperative against a substance of which a tiny volume represents millions of doses. What works belongs to public health: naloxone, tests, treatment of addiction. The strategic lesson is uncomfortable for security establishments: in a threat of this type, the health ministry weighs more than the defence ministry. For Europe, still relatively spared, the window of prevention is open, the nitazenes, more powerful still, are already detected on the continent.

▸ Sources
CDC Provisional Drug Overdose Death Counts 2026DEA National Drug Threat Assessment 2026Congressional Research Service Fentanyl and China 2026GAO Illicit fentanyl supply chain 2026UNODC World Drug Report 2025Brookings Fentanyl geopolitics 2026 ↗RAND Synthetic opioids 2025 ↗EMCDDA Nitazenes in Europe 2026

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