Europe's Digital Independence Push: EuroStack, Sovereign Cloud, and Breaking Free from US Infrastructure

What happens if a foreign government can flip a switch and cut your country off from its cloud infrastructure, payment networks, and communication platforms — overnight? This is not a theoretical question. It is the scenario European policymakers are actively planning around in 2026, and it is driving the largest technology independence push in the continent’s history.

TL;DR

France is migrating 2.5 million government workstations from Windows to Linux — one of the largest public sector OS migrations ever

The EU is building EuroStack: a full-stack alternative to US digital infrastructure across cloud, payments, AI, and identity

Wero — backed by 16 major European banks — is becoming a direct rival to Visa and Mastercard, targeting full retail rollout by 2027

The core driver is the US CLOUD Act and the “kill switch” risk: US law can compel American companies to hand over EU data regardless of where it is stored

European alternatives exist but face a steep gap: OVHCloud ($1.2B revenue) vs. AWS ($115B)

The Security Problem Behind the Headlines

This story is often framed as politics. The underlying issue is a security architecture problem.

When a European government uses Microsoft 365, its documents, emails, and communications are processed by a US-headquartered company subject to US law. The CLOUD Act (Clarifying Lawful Overseas Use of Data Act, 2018) allows US authorities to demand data from US companies regardless of which country that data is physically stored in. An Azure data center in Frankfurt does not make your data sovereign — Microsoft is still the operator, and Microsoft is a US company.

The same applies to payment infrastructure. When a European business processes a card payment through Visa or Mastercard, that transaction data flows through US-controlled networks. 47% of all eurozone card payment value passed through Visa and Mastercard in 2025.

The dependency stack looks like this:

Layer	US Dependency	EU Exposure
Cloud compute	AWS, Azure, Google Cloud	Public sector, critical infrastructure
Productivity software	Microsoft 365, Google Workspace	2.5M+ French civil servants alone
Communication	Teams, Zoom, Slack	Government, enterprise
Payment networks	Visa, Mastercard	47% of eurozone card volume
AI infrastructure	OpenAI, Anthropic, Google	Government and enterprise AI
App distribution	Google Play, Apple App Store	Mobile-dependent services

The theoretical risk: a sufficiently severe geopolitical rupture could result in US entities being prohibited from serving EU customers — similar to how SWIFT exclusions have been used as economic tools. The EU’s concern is being on the receiving end of that mechanism.

France’s Linux Migration: 2.5 Million Workstations

In April 2026, France’s Interministerial Digital Directorate (DINUM) announced the most significant public sector operating system migration in Western Europe: 2.5 million civil servant workstations moving from Microsoft Windows to Linux.

Every French ministry and public operator must submit implementation plans by autumn 2026. The migration targets the full desktop stack:

OS: Windows → Linux (distribution not yet standardized across ministries)
Office suite: Microsoft 365 → Euro Office — an open-source alternative launched in March 2026 by a European coalition including IONOS and Nextcloud, built on LibreOffice and Nextcloud infrastructure
Video conferencing: Microsoft Teams, Zoom, Webex → Visio, a French government-developed platform based on the open-source Jitsi stack, mandated for all 2.5 million civil servants by 2027
Cloud: Moving sensitive workloads to Scaleway, a French cloud provider that won a €180 million sovereign cloud tender from the European Commission

France is not alone. Germany’s state of Schleswig-Holstein has been migrating to Linux since 2021. The Dutch government has open-sourced significant internal tooling. But France’s scale — 2.5 million seats in a single announcement — is unprecedented for a Western democratic government.

What “Sovereign” Actually Means Here

A common misconception: storing data in a European data center does not make it sovereign if the operator is a US company. GAIA-X, the EU’s cloud federation initiative, has AWS, Azure, and Google Cloud as members — they can receive GAIA-X certifications for data portability and interoperability. That certification does not protect against a CLOUD Act request.

Genuine sovereignty requires:

EU-headquartered operator with no US parent company
EU-based personnel handling operations and security monitoring
EU legal jurisdiction — not subject to extraterritorial US law
Open-source or auditable software stack where possible

Scaleway, OVHcloud, Hetzner, and Deutsche Telekom’s Open Telekom Cloud meet these criteria. Microsoft Azure Germany, AWS EU, and Google Cloud Europe do not — regardless of where the servers physically sit.

EuroStack: Building a Full-Stack Alternative

EuroStack is the umbrella initiative for Europe’s technology independence effort. Unlike previous attempts (GAIA-X drew criticism for becoming an industry lobbying exercise), EuroStack takes a more direct approach: build replacements across every layer of the digital stack.

The three layers:

Physical Infrastructure

Semiconductor manufacturing: EU Chips Act targeting 20% of global chip production by 2030
Data centers: EU-owned or EU-operated facilities, not AWS/Azure co-location
Subsea cables: reducing dependence on US-controlled cable infrastructure

Logical Infrastructure

Cloud platforms: GAIA-X High+ certified providers, EuroHPC for AI compute
Digital identity: EUDI Wallet — EU digital identity standard, replacing dependence on Apple/Google identity frameworks
Open-source software: mandating or strongly preferring OSS for public sector procurement

Intermediation Services

Payment networks (see below)
App distribution: EU Digital Markets Act forcing alternative app store access on iOS and Android
Communication: Sovereign alternatives to Teams, Slack, WhatsApp for government use

The Gap Is Real

The scale difference is significant. OVHcloud — Europe’s largest cloud provider — generated approximately $1.2 billion in revenue in 2025. AWS generated $115 billion. This is not a gap that closes in one or two years. An open letter from European technology leaders warned that “Europe will lose out on digital innovation within less than three years at current rates” — suggesting the window for building viable alternatives is narrowing.

Wero: Europe’s Answer to Visa and Mastercard

The payment sovereignty piece has moved fastest. Wero — the brand name of the European Payments Initiative (EPI) — launched in 2024 as a person-to-person payment system and is expanding toward full retail by 2027.

The consortium behind Wero includes 16 major European banks and payment processors: BNP Paribas, Deutsche Bank, Worldline, ING, and others. In February 2026, EPI and the EuroPA Alliance signed an agreement creating a unified European payment infrastructure.

What Wero Actually Does

Instant bank-to-bank transfers using SEPA Instant Credit Transfer as the rails — no Visa/Mastercard network involved
Digital wallet for P2P payments, with expansion to online checkout and physical point-of-sale by 2027
European logo at checkout — a single recognizable brand across all participating countries
No transaction data leaving EU jurisdiction — unlike card payments which flow through US-operated networks

The Security Angle

Card payment data is intelligence. Every Visa and Mastercard transaction contains: who paid, what for, where, when, and how much. At 47% of eurozone card payment volume, that is a significant dataset flowing through non-EU-controlled infrastructure. Wero keeps that data within EU-operated systems and under EU law.

Current Status

Wero is live for P2P payments in France, Germany, and Belgium. Retail merchant integration is in pilot. Full alternative-to-card functionality — scanning a QR code at a supermarket with Wero instead of tapping a Visa card — is targeted for 2027.

The Realistic Assessment

European digital sovereignty is moving from aspiration to implementation — but timelines are long and the gaps are large.

What is already working:

France’s Linux mandate is real and funded
Wero is live and expanding
Scaleway and OVHcloud handle sensitive EU public sector workloads today
EUDI Wallet pilots are running in multiple member states
Euro Office launched in March 2026

What remains difficult:

Enterprise software depth: LibreOffice and Nextcloud are mature, but the ecosystem around Microsoft 365 (Power Automate, Dynamics, Copilot integration) has no direct European equivalent at scale
AI compute: NVIDIA dominance in GPU infrastructure means European AI runs on US-designed hardware regardless of where the data center sits
Developer tools: GitHub (Microsoft), npm, PyPI — the software supply chain runs largely on US infrastructure
Timeline: replacing 2.5 million Windows installs is a multi-year project with significant retraining costs

What This Means for Security Practitioners

If you work in security for a European organization, several practical implications follow from this shift:

For compliance and risk teams:

“Data stored in EU data center” is not sufficient for data sovereignty claims — audit the operator’s legal jurisdiction
CLOUD Act risk assessments should be part of vendor due diligence for US-headquartered cloud providers
Monitor EUCS (European Union Cybersecurity Certification Scheme for Cloud Services) High+ requirements — expected to become mandatory for critical infrastructure

For architects and engineers:

Sovereign cloud migrations require re-evaluating managed services: AWS Lambda, Azure AD, Google Workspace APIs all have European alternatives, but with different maturity levels
Open-source preference reduces single-vendor jurisdiction risk — but introduces supply chain security responsibilities
EUDI Wallet integration will become relevant for identity and authentication in EU-facing applications

For threat intelligence:

The EuroStack build-out creates new attack surface: less-mature platforms, new integrations, and migration periods are prime targeting opportunities for nation-state actors
Payment infrastructure transitions are historically high-risk periods for fraud campaigns

Linux Privilege Escalation: Attack Techniques and How to Detect Them — if you’re migrating to Linux at scale, this is the threat model to understand
AWS IAM Privilege Escalation: Attack and Detect — cloud security fundamentals that apply regardless of which provider you use
APT Groups and Nation-State Hackers: A 2026 Guide — the threat actors most interested in European infrastructure transitions