SUMMARY
The rapid development and widespread adoption of electronics, modern information and cyber technologies have led to the emergence of a new range of national security and defense risks and threats that are being implemented in cyberspace and (or) across cyberspace. There is a rapid growth of information and automation of all spheres of human activity, the amount of information stored, processed and transmitted, the speed of its transmission and processing, the complexity of control systems, the interaction between them and the links between management processes. Cyber threats cover all basic spheres of public activity (political, military, legal, economic, energy, infrastructure, social, spiritual, technological, etc.), destructively affecting national security as a whole.More than 60 countries, international (EU) and military-political alliances (NATO), international security organizations (OSCE) are focusing considerable efforts on providing capabilities to detect, prevent, neutralize and eliminate cyberspace threats in a timely manner, in particular in the field of defense.The results of the article are presented: analysis of the existing cyber security and cyber defense systems of the leading countries in the context of the possibility and expediency of implementing their experience in Ukraine; analysis of the prerequisites, current status and problems of the formation of cyber security and cyber defense systems in Ukraine, as well as the required level of their comprehensive provision; development of basic theoretical and applied provisions for the formation of cyber security and cyber defense systems in Ukraine.