Research & Publications

This paper presents individual country briefs for each of the 27 EU member states, profiling external supplier concentration across the six ISI dependency axes — energy, critical inputs, technology, defense, financial, and logistics. Each brief summarises the country's composite ISI score, axis-level concentration breakdown, and key structural characteristics. The profiles are designed to support national-level interpretation of the empirical results published in ISI Paper Series No. 2 and complement the cohort-wide analytical synthesis provided in Paper Series No. 3. No new data or methodology is introduced; the briefs repackage previously published measurements into per-country reference documents suitable for institutional and policy audiences.

This analytical brief presents a concise interpretive synthesis of the empirical findings from the International Sovereignty Index (ISI) applied to the EU-27 founding cohort. Drawing on the full dataset published in ISI Paper Series No. 2, the brief distils key structural patterns in external supplier concentration across six strategic dependency axes — energy, critical inputs, technology, defense, financial, and logistics. Country-level composite rankings, axis-level cohort distributions, and structural outlier profiles are summarised in an accessible format designed for institutional and policy audiences. The brief does not introduce new data; it provides an interpretive overlay on previously published measurements.

This paper presents the empirical application of the International Sovereignty Index (ISI) to the 27 member states of the European Union, constituting the founding release cohort. Using the methodological framework established in ISI Paper Series No. 1, we compute concentration scores across six strategic dependency axes for each EU-27 country. The paper reports composite rankings, axis-level aggregates, classification distributions, and structural outlier identification. Cross-country comparison reveals substantial heterogeneity in external supplier concentration profiles, with composite scores ranging from unconcentrated to highly concentrated across the cohort. The results establish a baseline measurement for longitudinal tracking and provide a reproducible reference dataset for downstream policy analysis.

This paper presents the methodological foundations of the International Sovereignty Index (ISI), a structural measurement framework designed to quantify the concentration of external supplier relationships across strategic dependency domains. The ISI applies Herfindahl-Hirschman Index (HHI) logic uniformly across six axes — energy, critical inputs, technology, defense, financial, and logistics — producing cardinal scores on a continuous [0, 1] interval. The paper details the four-layer computational architecture: supplier share computation, channel-level concentration, volume-weighted axis aggregation, and unweighted composite scoring. Classification thresholds, reproducibility standards, and the no-normalisation principle are formally specified. The framework is designed for deterministic reproducibility, institutional neutrality, and forward extensibility.