Abstract: The article is devoted to the study of the role and value of Institute of international law (international non-governmental organizations) in the development of international legal regulation in the nineteenth century. The author identifies and describes some of the prerequisites for the formation of these institutions, as well as characterizes the mission of the organization, lists the range of issues discussed at the meetings of its sessions. Special attention, as demonstration of theoretical and practical importance, is given to the issues of extradition of criminals, which were developed by the Institute of international law, are part of the decision on the issue. The role and importance of the Institute of international law in the development of international legal regulation is being formulated. The study analyzes the work of the Institute of international law, which is based primarily on the data that testifies to the results of activity of the examined structure of private law published in the pre-revolutionary publications. The scientific novelty of this research consists in the historical analysis of the international non-governmental organizations, particularly the Institute of International Law that remains insignificantly studies in modern research. The main conclusion of the study consists in the following: in the second half of the XIX century there has been established an extensive system of international non-governmental organizations that contributed to the development of international law. The Institute of International Law was of special importance for the development of international law due to the fact that it united the leading experts in this area. During the course of its work, the aforementioned institutions executed various issues, most relevant from the perspective of international legal regulation, which carries theoretical and practical character, as well as undoubtedly affected the content of the international law within the examined period.
 
Of particular importance to the development of international law was international law Institute, bringing together leading experts in this field. In the course of its work, the studied structure was engaged in a variety of issues, most relevant from the point of view of international legal regulation that had not only theoretical but also practical in nature, and have undoubtedly affected the content of international law in the period under review.

Abstract: The article investigates the administrative unions of the XIX century, which provided frameworks for the countries for cooperation on permanent basis. Crucial characteristics of international administrative unions, their specific features and some of reasons for these institutes formation are determined and described in this paper. Referring to the relevant international legal foundations, the most substantial, according to the author, examples of administrative unions, which have played essential role in correspondent directions of intergovernmental cooperation developing, are indicated here. More than that, main results of their activity are also illustrated in the article.Historical and legal analysis of international administrative unions system, based on scientific studies, the primary sources (international legal acts) and data on the results of administrative union activity are carried out in the frameworks of research.The scientific novelty of the research displayed in historical and legal analysis of international administrative unions as a stage of formation of international intergovernmental organizations.The main conclusions of the study are: The main prerequisites for the formation of the administrative unions system was an intensification of relations in various fields, including international law. Administrative Unions had a number of features: a contractual interstate general administrative and organizing characteristics. The Russian government took essential part in the formation and functioning of most unions. Administrative Unions became one of the first organizational forms of intergovernmental association integration. They made a base of international cooperation on permanent basics and became a foundation for developing international intergovernmental organizations.

Abstract: This article is dedicated to the examination of the role and place of the international non-governmental organizations in the development of international law in the late XIX century, when the active formation of the institutions that ensure international relations has begun. The author determines the key prerequisites for this process and reviews the work of a number of the private legal structures, namely of the Institute of International Law that played a crucial role in the development of the international law of the said period, as well as of Red Cross, Union of Criminal Law, and Penitentiary Congress. It is these non-governmental institutions that allowed establishing the dialogue between the society and the government, and contributed into the advancement of the international law. Basing on the mainly pre-revolutionary materials, the author conducts the historical analysis of the role and importance of the international non-governmental organizations in formation of the norms of international law. The following conclusions were made: by the middle of the XIX century have been formed the conditions for the establishment of the new system of multiple institutions that ensure international relations of the non-governmental nature; some of the international non-governmental organizations made a significant contribution into the advancement of the international law as a whole.

Abstract: The article is devoted to the study of issues related to national security in the context of their legal registration at the level of international law in the nineteenth century. The article investigates the category of national security, sovereignty, state territory, state border, customs and migration regime, the system of international security secure them in international law, it is determined the level of their formation within the specified period of time. The author has studied the international legal acts and relevant regulations of the Russian national legislation of the nineteenth century to regulate the relevant issues.In the study historical and legal analysis of the legal processing of issues directly related to national security, based on primary sources (international legal instruments and acts of domestic legislation adopted within the specified time period) and scientific papers on relevant issues are conducted.The novelty of the study lies in the historical-legal analysis of international legal regulation of issues related to national security in its relationship with national law.The main conclusions of the research are the following: national security began to take shape long before the advent of respective category, registration related issues occurred both at the level of national and international law; in the nineteenth century category sovereignty began to take shape legally , issues related to the state territory and state borders were regulated , customs and immigration regimes were expanded , forming system of international security started.