Problem setting. The interference of the Russian Federation in the internal affairs of Ukraine, intensification of intelligence activities, strengthening of informational and psychological pressure aiming to destabilize the socio-political situation, and finally, direct military aggression inevitably lead to the violation of military security of our state. Getting ready to meet complex invisible and hybrid threats requires a much more comprehensive approach than conventional warfare. It requires a flexible balance and coordination between civilian and military resources, depending on the nature of the crisis. Russia’s aggression against Ukraine requires rethinking of approaches to the formation of our state’s military security, as without its improvement it is impossible to ensure Ukraine’s national security. This important task should be the subject of a comprehensive study by Ukrainian scientists. Recent research and publications analysis. The theoretical basis of military security as a factor of stability of a society is constituted by the publications of the following leading scientists: V. Bogdanovich, O. Bodruk, O.Vlasyuk, V. Gorbulin, S. Kononenko, G. Perepelytsia, V. Pocheptsov, O. Reznikov, A. Semenchenko, G. Sytnyk, M. Sitsinska, M. Sungurovsky, V. Lipkan and other scientists. Highlighting previously unsettled parts of the general problem. At the same time, the dynamic development of Ukrainian society necessitates permanent analysis of the issues that form the basis of its development. In the context of hostilities, these issues require constant attention from scientists. Due to the approval of the new national security strategy, its provisions, undoubtedly, require the development of effective measures for its implementation. This particular issue is of scientific interest. The purpose of the article is to determine the main tasks of Ukraine’s military policy in the context of implementation of the new National Security Strategy of Ukraine. To achieve this goal, the following tasks should be solved: to determine the main evolution directions of European security management, to ascertain the attitude of the population and the scientific community to the interpretation of events in Ukraine, to determine the role and place of military security in the new strategy and outline the tasks of the Security and Defense Sector in ensuring national security. Paper main body. It is proved that Russia’s aggression against Ukraine has changed the European system of military security management. The existing contradictions between the EU and Russia, as a descendant of the USSR after the Cold War, despite the leadership’s unsubstantiated declarations of devotion to the democratic vector of Russia’s socio-political development, intensified with Putin’s rise to power because of his ambition to revive the Russian Empire in its former borders. These ambitions were fulfilled during the war with Georgia and Ukraine. It is accentuated that despite the general condemnation of Russia’s policy, which challenges the European community, not all EU countries consider Russia an aggressor due to historical bonds and economic benefits. While supporting Ukraine’s membership in the EU and NATO in general, Europeans do not consider it necessary to help Ukraine by providing it with modern weapons. The article proves that in this context, Ukraine should focus its military policy mainly on its own forces, which, in turn, requires the formation and implementation of military policy based on the best world standards. Based on the analysis of draft strategic documents, the priorities, tasks and main ways of the Security and Defense Sector development are determined in the context of new challenges and threats. Conclusions of the research and prospects for further studies.The adoption of the new National Security Strategy of Ukraine marked a new stage in the development of the theory of security, due to the evolution of the concepts of security and defense of European countries against the background of Russia’s aggression against Ukraine. The strategy for the first time proclaimed the creation of a comprehensive defense system, which requires the involvement of all spheres of Ukrainian society in addressing military security issues. As part of the implementation of this Strategy, the country’s military policy should ensure the rapid development of the Security and Defense Sector through the introduction of innovative approaches that provide sufficient national defense capabilities to repel armed aggression, and to carry out a comprehensive reform of the national security system to the level acceptable for membership in EU and NATO.