Historical analysis of public administration mechanisms for Ukraine's National Security in response to Russian armed aggression (2014-2025)

From a legal and institutional perspective, in situations of prolonged armed conflict, such as that which has been ongoing in Ukraine since 2014, national security becomes a comprehensive phenomenon that encompasses the entire state apparatus. In this scenario, the objective of the research is to analyze historically the public administration mechanisms implemented by the Ukrainian state between 2014 and 2025 to guarantee national security in the face of Russian armed aggression, identifying in the process its institutional transformations, civil defense strategies and intergovernmental coordination processes. To meet this objective, a research methodology was developed based on the selection and traceability of documentary materials, qualitative research, and internal and external criticism of sources. In our conclusions, we argue that historical science must question how this confrontation is transforming essential concepts about national sovereignty, the international order, collective security and the future of liberal democracy in the 21st century, recognizing that Ukraine has become a battlefield, not only in territorial terms, but also in ideological terms, which reveals much about the political future of Europe and the world today.