The article presents a study of the theoretical and legal foundations of the legal support of cybersecurity of the critical information infrastructure of Ukraine based on the system approach methodology. The current legislation is considered, and the bylaws of Ukraine in the field of cybersecurity of critical information infrastructure are analyzed. It is noted that today in Ukraine, it is important to ensure effective management of regional information security systems and the smooth and efficient operation of information infrastructure, especially critical infrastructure. To achieve these results in practice, it is necessary to prioritize implementing such critical tasks as the development of human resources in cybersecurity and the development of the national field of information technology. It is substantiated that cybersecurity is required to improve legal, organizational, and technical mechanisms for regulating public relations that arise in the information sphere. It is concluded that cybersecurity of critical information infrastructure of Ukraine is possible by identifying objects of this structure, solving problems of cybersecurity of objects with a very long life cycle, developing methods of modernization of critical information infrastructure for each organization, technology and information structure, which are the objects of critical information infrastructure.

The article examines the phenomenon of "juvenile delinquency", assesses its actual state and establishes the tendencies of its manifestations. Juvenile delinquency in Ukraine as a part of crime in a broad sense arises and develops under the influence of certain determinants. The study of the causes and conditions of juvenile delinquency remains relevant today, which indicates the special danger of this kind of crime for the development of society. The purpose of the article is to study the state of the problem in Ukraine and the experience of other countries in minimising the criminal behaviour of minors in the process of property and non-property relations. The leading approach that was used when writing the article is the comparison and analysis of modern materials on the problems of criminal behaviour of criminals who have not reached the age of majority. As a result, it was possible to identify the social characteristics of juvenile criminals and the reasons for their criminal behaviour. Considerable attention is paid to the factors influencing the commission of crimes: a dysfunctional family, shortcomings of the educational process, the problem of alcohol and drug use by minors. In addition, some directions for the prevention of juvenile delinquency were developed. The applied value is the ability to change legislation in terms of work and correction of minor criminals' behaviour.

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Problems with regulating the trafficking of weapons and ammunition emerged in Ukraine after the collapse of the Soviet Union. The Soviet military left behind a large number of small arms, light weapons and ammunition, much of which did not have proper (in some cases any whatsoever) inventory control and accounting. The purpose of the study is to find the best models of criminal liability for illicit manufacturing and trafficking of firearms in Ukraine, its parts and components and ammunition, taking into account international experience. The study investigates the issue of compliance of the criminal legislation of Ukraine with the United Nations Protocol against the Illicit Manufacturing of and Trafficking in Firearms, Their Parts and Components and Ammunition, supplementing the United Nations Convention against Transnational Organised Crime, and proposes for harmonisation of national legislation with this Protocol. It is concluded that Ukraine needs to adopt the Law "On Arms Trafficking", which, among other things, must clearly define such concepts as "firearms", "parts and components", "ammunition", "illicit manufacturing", "illicit trafficking", etc. which would also be relevant for the criminal legislation of Ukraine.

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