Source: AWS Security Blog
On Saturday 24 October 2026, AWS ran a live exercise in which its European Sovereign Cloud operated for several hours with no connection to the AWS Global Network backbone. The backbone is the private network that normally moves authorised AWS operational data between AWS locations without touching the public internet. For the duration of the exercise, that traffic was rerouted over dedicated internet connectivity from European internet service providers.
An entirely European operation
The exercise was executed by an operational team composed entirely of EU residents working inside the EU, using only the hardware and software resources of the European Sovereign Cloud itself. The region runs out of data centers in Brandenburg, Germany, physically and logically separate from other AWS regions, and holds a local in-EU copy of the AWS source code. Customer content and customer-created metadata stay in the EU at all times.
A second global system, a dedicated channel that the local EU team uses to manage limited and controlled transfers of operational data, was switched off entirely during the exercise. AWS states that neither system is operation-critical, and that the region can run independently at any time.
Brief disruption windows, no availability impact
AWS said the exercise would not affect service availability within the European Sovereign Cloud, other AWS regions, or private connectivity through AWS Direct Connect. Customers could experience short connectivity disruptions at the start and at the end of the exercise, when routing information converges as traffic moves between the backbone and the European internet links.
Evidence for regulators
The exercise was designed to produce verifiable technical and operational evidence that the cloud can operate independently within the EU, consistent with the objectives of the European Commission’s EU Cloud Sovereignty Framework and the criteria of the C3A framework from Germany’s Federal Office for Information Security (BSI). The results feed into the Sovereign Reference Framework (ESC-SRF), the evidence package AWS offers to regulated customers and public sector organisations across Europe. AWS has said it will share an update with regulators and customers after the exercise.
What this means for European businesses
Digital sovereignty has moved from a political talking point to a technical, auditable requirement, and cloud buyers in Europe are increasingly expected to show where their data lives and who can reach it. If your organisation is evaluating sovereign cloud options, mapping regulated workloads to the right region, or preparing evidence for compliance authorities, we can help you cut through the marketing and build an architecture that stands up to scrutiny. Contact us for honest, practical advice on your cloud strategy.