**Introduction** Diversifying suppliers and export markets strengthens Europe’s resilience by reducing concentration risk and improving shock absorption. It does not, however, fully protect Europe from the structural pressures generated by great-power competition. Many of the most consequential constraints arise from upstream technological chokepoints, security-linked trade instruments, and regulatory fragmentation that cannot be neutralized simply by expanding the number of trade partners. Durable protection requires diversification combined with coordinated economic-security policy and stronger trade governance[1][2][3]. **Limitations of diversification as a strategic safeguard** **1.** **Limited substitutability in strategic upstream sectors** Diversification is most effective when alternative inputs are easy to source and firms can change suppliers without significant cost or delay. In several strategic sectors — advanced semiconductors, critical mineral processing, precision manufacturing equipment, and certain clean-energy components — global production remains highly concentrated and replacing existing suppliers is challenging. Vulnerability therefore depends not only on concentration levels but also on how quickly and at what cost firms can move to other suppliers[1]. While some downstream activities have diversified geographically, upstream processing and high-value technology segments remain concentrated in a limited number of jurisdictions[2]. Where concentration coincides with limited substitutability, additional suppliers reduce marginal exposure but do not eliminate structural dependence. **2.** **Security controls and regulatory constraints across jurisdictions** Great-power competition increasingly plays out through export controls, investment screening, outbound investment restrictions, subsidy conditions, and security-based procurement rules. These measures affect technologies, firms, and cross-border investment activity across jurisdictions rather than targeting a single trade route[3]. In this environment, shifting trade flows does not eliminate exposure to licensing requirements, compliance obligations, or restrictions on access to key technologies imposed by major economies. Differences in national regulations and the growing use of security-related trade measures continue to shape firm decisions even when supply chains are geographically diversified[3][4]. **3.** **Narrower diversification options in a fragmented trade environment** Diversification provides the strongest resilience benefits when trade and investment flows operate within an open and predictable system. As the global economy becomes more divided along geopolitical lines, opportunities for risk-sharing across countries decline and the benefits of diversification diminish[5]. While spreading supply chains across more locations can reduce exposure to country-specific shocks, doing so often involves higher costs and adjustment challenges[6]. When geopolitical alignment shapes market access, subsidy regimes, and regulatory compatibility, the range of commercially and politically feasible partners can shrink. In this setting, diversification remains necessary but cannot fully counter broader structural pressures[5][6]. Policy tools such as semiconductor investment screening and local content requirements reinforce this narrowing effect by influencing where firms are permitted or incentivized to invest and produce[7][8]. **Conclusion** Supplier and market diversification is an essential part of Europe’s response to geopolitical risk, but it does not sufficiently protect against great-power competition. Concentration in upstream technologies, the cross-border application of security and regulatory measures, and weaker diversification benefits in a more fragmented global economy limit what diversification alone can achieve.
