Sydiaha , Volodymyr. “TRANSFORMATION OF THE EUROPEAN UNION’S SECURITY POLICY IN THE CONTEXT OF RUSSIAN AGGRESSION AGAINST UKRAINE: INSTITUTIONAL AND CONCEPTUAL DIMENSIONS”. Current Problems of Sustainable Development 2, no. 5 (August 15, 2025): 220–234. Accessed June 26, 2026. https://journals.csr.com.ua/index.php/sustainability/article/view/157.