ANALYSIS: France's Cyber Defense Regiment Goes to Learn Digital Warfare from the Ukrainians

ANALYSIS: France's Cyber Defense Regiment Goes to Learn Digital Warfare from the Ukrainians

Introduction: When France sends its cyber soldiers to learn from Ukraine

A discreet decision, a powerful strategic signal

On June 24, 2026, Intelligence Online revealed a piece of information that passed almost unnoticed beneath the noise of strikes and summits: the French Army's cyber defense regiment is sending specialists to Ukraine to acquire direct operational experience. Not to fight. Not to advise in the military sense of the term. But to learn — from practitioners who have been waging cyber war in real conditions for more than ten years against the best state-sponsored attack groups on the planet.

This decision, however discreet its official framing, carries considerable strategic significance. It means that French cyber defense professionals are implicitly acknowledging that Ukraine possesses operational cyber expertise that France does not have — and that it is more effective to go learn it in the field than to acquire it through exercises or simulations. That is a remarkable admission of lucidity.

Ukraine, living laboratory of cyber-military doctrine

Since 2014 — and on an unprecedented scale since 2022 — Ukraine has been enduring and repelling cyberattacks of an intensity, sophistication and diversity that no other country in the world has ever experienced over such a sustained period. Attacks against power grids (Industroyer, 2016), destructive malware (NotPetya, 2017), persistent campaigns by the GRU and FSB against command systems, officers' messaging apps, critical infrastructure — all of this has forged an absolutely unique Ukrainian operational experience.

Ukrainian armed forces and the SBU have developed responses that exist nowhere in NATO doctrinal manuals: rapid recovery procedures after an attack, resilient communication architectures, network compartmentalization protocols, detection and attribution methods for attacks within very short timeframes. That body of know-how is what French cyber soldiers are going to seek out.

The French cyber defense regiment: who are they?

A specialized unit at the heart of the army's digital transformation

The French Army's cyber defense regiment — officially the 807th Transmissions Regiment, based in Douai with detachments at Cesson-Sévigné — is the unit responsible for the operational cyber defense of French armed forces information systems. It works in close coordination with the Cyber Defense Command (COMCYBER), attached to the Armed Forces Chief of Staff, and with ANSSI (National Agency for Information Systems Security) on government aspects.

These specialists are trained in intrusion detection, incident response, digital investigation and protection of military command systems. Their competence is real. But it was developed in a context of exercises, simulations and low- to medium-intensity incidents — not in the context of a high-intensity war where a state adversary mobilizes all its cyber capabilities around the clock.

High-intensity cyber war: a qualitative leap

The difference between cyber defense in peacetime and cyber defense in high-intensity war is of the same order as the difference between military training exercises and actual combat. In the first case, rules are known, scenarios are anticipated, systems are protected. In the second, the adversary actively seeks to surprise, to saturate and to exploit every vulnerability in real time, while targets are simultaneously under kinetic pressure.

That is the environment in which Ukrainian cyber defenders work. Their French counterparts are arriving to understand how one manages a simultaneous attack on command systems during a ground offensive, how one maintains operational communications when network nodes are systematically targeted, how one quickly attributes an attack to enable an appropriate response. Questions that only real experience can answer.

Ukraine's transformation into a NATO cyber center of excellence

Expertise that crosses national borders

The French initiative is not isolated. Several NATO member states — notably the United States, the United Kingdom, Estonia and Lithuania — have developed enhanced cyber cooperation programs with Ukraine since 2022. The US Cyber Command (USCYBERCOM) notably deployed Hunt Forward Operations teams in Ukraine, tracking adversary groups on Ukrainian networks to collect intelligence on the tactics, techniques and procedures of Russian groups.

This cooperation model — allies deploy their experts on Ukrainian networks, collect operational experience and share threat intelligence — is transforming Ukraine into a de facto cyber center of excellence for the Atlantic Alliance. The NATO Cyber Centre in Tallinn remains the reference institution for doctrine, but it is Ukraine that provides the real-world use cases.

Lessons from the Ukrainian cyber war for NATO doctrine

Several major lessons emerging from the Ukrainian experience deserve to be integrated into NATO's cyber doctrine. The first is the need for architectural resilience: systems designed to keep functioning even when partially compromised or attacked, with rapid recovery and degraded-mode capabilities. The second is the importance of attribution speed: quickly identifying the source and nature of an attack to enable an appropriate response. The third is the value of cyber reserves: civilian specialists who can be rapidly mobilized to reinforce military teams in a major crisis.

Ukraine has implemented innovative versions of all three approaches. Its IT reserve, composed of thousands of civilian digital professionals mobilized to defend critical infrastructure, is a model that existed in no Western military doctrine before 2022. The French cyber soldiers arriving in Kyiv or elsewhere will likely depart with that reality firmly in mind.

Russian attacks of June 25, 2026: the immediate context

The SBU-FBI revelation as an illustration of real-time threat

The revelation on June 25, 2026 by the SBU and the FBI of a systematic Russian campaign of attacks against the messaging apps of Ukrainian officials and military personnel arrives precisely as French cyber soldiers are preparing their deployment. That is the type of operation those specialists will observe and learn to counter: sophisticated phishing, impersonation of official bots, psychologically timed pressure exploiting user fatigue.

These attacks against messaging apps illustrate a crucial point: cyber war does not only target critical infrastructure and military command systems. It also targets the individual communications of officials, seeking to collect human intelligence through digital means — at lower cost, with reduced exposure risk for the attacker. That is a form of 21st-century espionage that conventional armies do not yet know how to counter effectively.

The documented intensification since early 2026

CERT-EU documented as early as February 2026 a sophisticated campaign impersonating the support bot of the Signal application, targeting political, military and journalistic figures in several European countries. That campaign was attributed with high confidence to the APT28 group linked to the Russian GRU. It illustrates the extension of Russian cyber war beyond Ukraine — toward the allies supporting Kyiv.

It is precisely that dynamic of extension — from a cyber war initially targeting Ukraine toward a cyber war aimed at the entire West — that makes the Ukrainian experience so crucial for allied armies. What Ukraine is learning to counter today, France, Germany and the rest of Europe could have to counter tomorrow at comparable intensity.

Implications for NATO preparation at the Ankara summit

Cyber in the equation of allied capabilities

The NATO summit in Ankara on July 7–8, 2026 is expected to see important announcements on collective defensive capabilities. Secretary General Mark Rutte announced contracts for "tens of billions of dollars" in three areas: long-range deep strike, air defense and autonomous systems. Cyber defense is not explicitly cited in that triad — but it is cross-cutting to all these capabilities.

No long-range strike capability, no air defense system, no autonomous drone can function without secure communication and command systems. If those systems are compromised by adversary cyber operations, the most sophisticated military capabilities become unusable or dangerous. Investment in cyber capabilities is therefore the prerequisite for the effectiveness of all other defensive investments.

France and its vision of cyber "strategic autonomy"

France's approach of sending experts to Ukraine fits within President Macron's vision of European "strategic autonomy" — a Europe capable of defending itself, complementing but not exclusively dependent on the United States. In the cyber domain, that strategic autonomy requires European countries to develop their own detection, response and, if necessary, cyber retaliation capabilities.

Ukraine, paradoxically, can help build that European cyber strategic autonomy. By sharing its operational experience with European allies, it contributes to strengthening the entire Western defensive ecosystem. That is a form of contribution to collective security that few commentators acknowledge, too busy measuring support in terms of tanks and missiles.

Franco-Ukrainian cooperation: beyond cyber

A strategic partnership in development

The deployment of cyber specialists fits within a broader Franco-Ukrainian cooperation that has deepened since 2022. France has provided Ukraine with CAESAR artillery systems, AMX-10RC armored vehicles, SCALP missiles (equivalent to the British Storm Shadow), and committed to delivering Mirage 2000 aircraft. The French ambassador in Kyiv also confirmed in June 2026 that Rafales will soon join Ukraine's fleet, alongside F-16s and Gripens.

This increasingly close military relationship naturally creates a framework for technical and doctrinal exchanges in the cyber domain. Armies that fight with the same weapons systems have an interest in sharing their knowledge about protecting those systems against adversary cyber attacks. A Rafale or Mirage on a mission over Ukraine depends on communication and guidance systems that can be targeted by Russian electronic and cyber warfare.

Mutual feedback: Ukraine also learns from France

If France sends its specialists to learn from Ukraine, that cooperation is likely bidirectional. Ukrainians can learn from the French regarding NATO standards, systems interoperability, certification procedures and doctrine for employing cyber capabilities within an allied framework. Cyber cooperation between allied nations is rarely a one-way flow — it is an exchange in which each side brings what it has and learns what it does not.

That reciprocity is valuable for Ukraine in its perspective of NATO membership. Joining the Alliance requires not only military capabilities but also systems, processes and organizational cultures compatible with allied standards. Cooperation with the French cyber defense regiment contributes to the gradual integration of Ukrainian practices into the NATO framework.

The future: toward a revised allied cyber doctrine

Integrating Ukrainian lessons into training curricula

The long-term challenge is not only sending a few French specialists to learn in Ukraine for a few weeks. It is to systematize this operational feedback, document it, integrate it into the training programs and doctrines of allied armies, and update the manuals governing the use of cyber capabilities accordingly. This institutionalization work takes time — but its impact is structural and lasting.

The NATO Cyber Centre of Excellence in Tallinn should play a central role in this integration. Exercises such as Cyber Coalition, organized annually by NATO, should be redesigned in light of the real scenarios documented in Ukraine. The training programs for cyber officers of allied armies should systematically include modules based on real Ukrainian cases. This work is underway — but it needs to accelerate.

The question of resources: financing cyber excellence at the level of the threat

None of these doctrinal evolutions will be possible without substantial financial investment in the cyber capabilities of allied armies. Several NATO countries still dedicate an insufficient share of their defense budgets to cyber capabilities. In a context where Alliance members are called upon to reach 2% of GDP in defense spending — and some are heading toward 3% or more — the question is what proportion of those expenditures goes toward cyber capabilities.

The honest answer is: probably too little. Conventional equipment — tanks, aircraft, missiles — is more politically visible and benefits from well-established industrial lobbies. Cyber capabilities are less spectacular and their benefits are harder to quantify for elected officials confronting budget trade-offs. It falls to cyber defense professionals to make these investments legible and convincing for their political decision-makers.

The Ukrainian cyber war lessons for NATO doctrine

A catalogue of techniques unprecedented in the history of cyber warfare

The Ukrainian cyber war has produced a catalogue of techniques and counter-measures without parallel in the history of modern conflict. Russia deployed virtually its entire cyber arsenal there: destructive wipers like NotPetya and its successors, attacks on critical infrastructure, large-scale disinformation, manipulation of industrial control systems. Ukraine survived those attacks through improvised defense in depth, the resilience of its technicians and the support of Western partners.

What French cyber specialists are coming to learn in Kyiv is precisely that experience of defense under real attack. Exercises and laboratory simulations cannot reproduce the psychological pressure, speed of decision and creativity required when critical systems are genuinely threatened. Ukrainian cyber soldiers have developed defensive reflexes that the best-equipped but unexposed armies do not have. That know-how is irreplaceable.

Toward a reinforced allied cyber doctrine after Ankara

The NATO Ankara summit should include decisions on strengthening cyber cooperation within the Alliance. The presence of French and other allied specialists in Ukraine creates a base of shared experiences that can feed a revision of NATO cyber doctrine. Concepts emerging from Kyiv — active defense, critical infrastructure resilience, proportionate counter-action in cyberspace — are becoming the Alliance's new standards.

The Franco-Ukrainian cyber cooperation illustrates how the most engaged allies can influence the entire Alliance. France is not only sending its specialists to Ukraine to train them — it is sending ambassadors of its doctrine, who will bring the field's lessons back to Paris and contribute to modernizing French operational concepts. That is a bilateral investment with multilateral dividends. And it is exactly the type of cooperation NATO needs more of.

Conclusion: The Ukrainian lesson, a strategic legacy for NATO

What France will bring back from Kyiv

The specialists of the French cyber defense regiment heading to Ukraine will return with something irreplaceable: direct experience of a real combat cyber environment. They will have seen how professional teams manage incidents under maximum operational pressure. They will have observed methods and architectures developed out of necessity in a war context. They will have talked with counterparts who have lived through what no exercise can reproduce.

That knowledge cannot be transmitted through manuals or simulations. It is transmitted through shared experience. And that is precisely what Ukraine offers its allies — unique access to the most advanced frontier of modern cyber warfare. France had the wisdom to go seek that access. Other allied nations should follow without delay.

Ukraine as a net contributor to NATO security

We often speak of Ukraine as a beneficiary of Western support — and that is an indisputable reality. But that relationship is more symmetrical than it appears. Ukraine is also a net contributor to Western security: by absorbing and repelling Russian military and cyber capabilities, it reduces the pressure Moscow can exert on other Alliance members. And by sharing its operational experience, it directly contributes to the defensive preparation of allied countries.

The French cyber defense regiment initiative is an implicit recognition of that reciprocity. It should accelerate the reflection on Ukraine's NATO membership — not as a burden on the Alliance, but as a strategic asset whose value is now proven at the highest level.

By Maxime Marquette, columnist

Columnist's transparency note

Sources and limits of my analysis

This analysis rests on the Intelligence Online revelation of June 24, 2026, public documents from CERT-EU, and declarations from NATO, the SBU and the French ambassador. I do not have access to classified details of this Franco-Ukrainian cooperation — neither the exact program of deployed specialists nor their results. My analysis is therefore structurally incomplete on those operational aspects.

Assumed biases

I believe that supporting Ukraine is both morally right and strategically necessary for European security. I also believe that NATO countries collectively underinvest in their cyber capabilities. Both convictions shape my analysis.

Sources

Primary sources

Intelligence Online — French cyber defence regiment sending specialists to learn in Ukraine — June 24, 2026

UA.News — Russian intelligence agencies attacked the messaging apps used by Ukrainian officials and military — June 25, 2026

Secondary sources

CERT-EU — Cyber Brief 26-03, February 2026 — February 3, 2026

Cyber Warrior 76 — Strategic Cyber Threat Intelligence Briefing, Russian cyber operations targeting NATO — June 27, 2026

Brussels Signal — Europe's biggest military powers pledge stronger NATO role ahead of Ankara summit — June 25, 2026

Army Recognition — French Ambassador confirms Rafale fighters will soon join Ukraine's F-16 and Gripen fleets — June 27, 2026