Novitskyi, VladyslavKrusian, AnzhelikaShynkar, TetianaDemydenko, VolodymyrLemekha, Roman2026-04-212026-04-212026Novitskyi, V., Krusian, A., Shynkar, T., Demydenko, V., & Lemekha, R. (2026). Legal integrative framework in the European Union: Analysis of the key principles and their influence on the national legislation. Janus.net, e-journal of International Relations, 16(2), 66–81. https://doi.org/10.26619/1647-7251.DT0226.4https://doi.org/10.26619/1647-7251.DT0226.4https://dspace.e-u.edu.ua/handle/123456789/1819Legal integration in the European Union is a systemic phenomenon which goes beyond the coordination of national legislation and forms a supranational regulatory mechanism. The relevance of the study stems from the need to understand the role of the principles of legal integration as the basis of the EU's legal unity, and to analyze their impact on the transformation of legal systems of individual countries in the context of the growing volume of EU rules and the evolution of integration processes. The aim is to clarify the essence, structure and practical impact of the EU legal integration principles (rule of law, direct effect, subsidiarity, proportionality) on the formation and implementation of national legislation of the Member States, as well as to assess their role in creating a single legal space. The study is based on dialectical, hermeneutical, historical and legal, and comparative legal methods. The author analyzed the EU founding treaties, secondary legislation, case law, and constitutional provisions of the Member States. Modeling and forecasting methods were used to assess the prospects for the development of legal integration. It is established that legal integration in the EU forms an autonomous system that harmonizes national legal order systems through the rule of law. The author identifies the mechanisms of adaptation of national legislation to EU norms, in particular, through subsidiary control and judicial supervision, which ensure a balance between the supranational and national levels. Further research may be aimed at analyzing the effectiveness of the subsidiary control mechanism, deepening the study of judicial influence on legal integration, and forecasting the evolution of the EU legal area in the context of new challenges.enUkrainian constitutionalismhuman rightsmunicipal securityEuropean Unionlegal integrationsupranational lawArticle