European sovereignty in the 21st century is no longer defined by borders, legal authority, or regulatory reach alone. It is defined by material capability: the ability to secure energy, sustain industrial competitiveness, deploy technology at scale, and absorb shocks without external coercion. As global systems fragment and power shifts from rules to infrastructure, sovereignty has become a question of system control rather than formal jurisdiction. This article defines what sovereignty now means for Europe — and why democratic self-government depends on rebuilding the material foundations that make political choice viable.

Preface — Sovereignty, Systems, and the Return of Capability

For much of the post–Cold War period, sovereignty was discussed primarily in legal, normative, and institutional terms. Autonomy was associated with rule-making, regulatory authority, and participation in international regimes. The underlying assumption was that material conditions — energy supply, industrial capacity, and economic scale — would remain sufficiently abundant and stable to support those arrangements.

That assumption no longer holds.

In an era of geopolitical fragmentation, technological acceleration, and energy constraint, sovereignty has re-materialised. The capacity to act, decide, and endure increasingly depends on control over physical and economic systems: energy, production, infrastructure, capital formation, and technological deployment. Where those foundations erode, formal authority persists but effective agency declines.

This shift helps explain the emergence of alternative sovereignty narratives, including proposals that seek to relocate political authority away from territorially grounded democracies toward digitally mediated networks, platforms, or private governance structures. Such ideas — often framed as post-national or “network-based” forms of sovereignty — gain traction precisely where states appear unable to deliver stability, prosperity, or control over critical systems.

This article takes a different position. It argues that the erosion of sovereignty is not a reason to abandon the nation-state or democratic governance, but a signal that material capability has been neglected. Sovereignty cannot be virtualised, outsourced, or replaced by networks without hollowing out democratic accountability. Durable political autonomy still requires territorially anchored energy systems, industrial capacity, and economic competitiveness capable of supporting collective decision-making.

For Europe, the challenge is therefore not to transcend sovereignty, but to rebuild it on modern foundations. Energy affordability, industrial depth, technological capability, and long-term capital formation are not technocratic concerns; they are the preconditions for democratic self-rule. Without them, sovereignty risks becoming declarative — and alternatives that bypass democratic institutions will continue to gain appeal.

This article establishes the conceptual definition of European sovereignty used throughout the EU Sovereignty analyses that follow. It provides the framework for assessing energy policy, industrial strategy, digital and monetary sovereignty, and the political conditions required to translate ambition into capability in a contested global order.

European sovereignty in the 21st century is no longer defined primarily by law, borders, or regulatory autonomy. It is defined by material capability. In an era of geopolitical fragmentation, technological acceleration, and strategic competition, sovereignty is the ability to act, decide, and endure without external coercion.

For the European Union, this leads to a central conclusion:
there is no defence, security, AI, digital, or monetary sovereignty without affordable energy and sustained economic competitiveness. These are not separate policy areas but mutually reinforcing foundations of power.

Historical and theoretical context.

For much of the post-Westphalian era, sovereignty was anchored in territorial control and hard borders. During the Cold War, states could still defend autonomy primarily through geography, military deterrence, and national industrial systems. From the 1970s onward—accelerated by financial liberalisation, global supply chains, and decisively by the internet—borders became increasingly porous to capital, data, energy flows, and technology. In international relations terms, sovereignty shifted from a classical realist conception of territorial control to a form of structural and interdependent power, where dependence on external systems constrains state autonomy even in the absence of military conflict. As borders became more open to flows of trade, capital, energy, and data, the ability of individual nation-states to act alone gradually diminished, while influence increasingly shifted toward geopolitical unions and alliances able to pool scale, coordinate policy, and protect shared economic and security interests in an interconnected world.

As borders lost their impermeability, the effective unit of sovereignty also shifted: individual nation-states, especially medium-sized ones, became structurally weaker, while power increasingly accrued to geopolitical unions and alliances capable of aggregating markets, energy systems, capital, technology, and security—making collective scale and coordination a prerequisite for meaningful sovereignty in an interdependent world.

Modern defence systems, digital infrastructure, AI deployment, and industrial production are all energy- and capital-intensive. High energy costs, fragile supply chains, and declining industrial competitiveness therefore translate directly into strategic vulnerability. Regulation alone cannot substitute for industrial depth, nor can normative influence replace control over energy, technology, and production systems.

Sovereignty today is exercised by actors that integrate:

Energy abundance and system reliability
Competitive industrial capacity and advanced manufacturing
AI, compute, and digital infrastructure embedded in the real economy
Long-term capital formation and state coordination

Europe’s strategic challenge is structural, not ideological. Without aligning energy systems, industrial policy, technological deployment, and security objectives into a coherent architecture, sovereignty risks becoming declarative rather than real.

Rebuilding European sovereignty requires a shift from fragmented, short-term optimisation toward integrated capability-building. Energy affordability is the keystone. Economic competitiveness is the transmission mechanism. Together, they are the precondition for every other form of sovereignty Europe seeks to claim.