Abstract
This edited volume, featuring contributions by Antonina Bakardjieva Engelbrekt, Per Ekman, Anna Michalski, and Lars Oxelheim, offers an interdisciplinary analysis of the contemporary challenges facing the European Union's external and internal borders. The book addresses a "Conflictual World," examining how geopolitical tensions, particularly those related to Russia, energy security (e.g., REPowerEU), and the weaponization of economic instruments like sanctions, reshape the concept and reality of the EU's frontier. The analysis is structured around key thematic areas: the integrity of the internal market and free movement, as governed by the Schengen Agreement; the legal and political dynamics of border securitisation; and the fundamental adherence to the Rule of Law under stress. It highlights the growing tension between open borders, a foundational EU principle, and the imperative for enhanced security and defense mechanisms in response to heightened global instability. The work is essential for scholars and policymakers seeking to understand the complex, multi-layered governance of borders in an era of renewed great power competition.
Keywords. European Union Borders; Geopolitics; Conflictual World; Free Movement; Securitisation; Interdisciplinary European Studies; Rule of Law.
JEL. F13; F50; H77; K33; P52.

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