Resources for journalists, analysts, and media organisations covering the International Sovereignty Index. All data and methodological documentation are published under CC-BY-4.0.
Principal empirical results from the EU-27 founding cohort assessment.
Defense concentration is the #1 variance driver
Axis 4 (Defense Industrial Base) accounts for approximately 35% of cross-country variance in the EU-27 cohort. Countries with near-total US defense procurement dependency exhibit structurally higher composite concentration.
EU-27 cohort mean: moderately concentrated
The cohort mean composite score falls in the 'Moderately Concentrated' band (0.25–0.50 HHI), indicating systemic external dependency across member states rather than isolated cases.
Energy diversification yields the largest composite improvement
Scenario simulations show that a 15 percentage-point reduction in energy axis concentration produces the largest absolute improvement in composite scores for energy-dependent states (Baltic, Bulgaria, Hungary).
Financial axis is the most uniformly distributed
Axis 1 (Financial & Payment Systems) shows the lowest inter-country variance, reflecting shared EU-wide exposure through SWIFT, TARGET2, and international clearing infrastructure.
Small states face structural concentration disadvantage
Malta, Cyprus, and Luxembourg exhibit higher composite scores partly due to smaller import baskets, which mechanically reduce diversification possibilities across multiple axes.
All resources are freely available under open-access licensing.
Dataset (CSV)
Machine-readable composite and axis-level scores for all EU-27 countries
Dataset (JSON)
Structured dataset with metadata, schema version, and nested axis scores
Methodology Paper (PDF)
Full methodological documentation of the HHI framework and axis construction
EU-27 Cohort Analysis
Aggregate statistics, distribution, and rankings for the founding EU-27 cohort
Interactive Country Profiles
Individual sovereign profiles with per-axis breakdown and supplier detail
When referencing ISI data or findings, please use the following citation format. The ISI dataset is versioned and archived through Zenodo with a persistent DOI.
Drazsky, S., & International Sovereignty Institute. (2026). International Sovereignty Index (ISI) — EU-27 Founding Cohort (v1.0). Zenodo. https://doi.org/10.5281/zenodo.18764170
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