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The article investigates the formal models as a method of analysis in international studies. The importance of this type of models in writing articles for world leading high-ranking journals from Scopus list is shown. The author reveals the main challenges of interdisciplinary synthesis related to the construction of formal models. The problem of identifying the actors of international relations is revealed, including the assessment of actor's involvement in a concrete international conflict (or process) in the context of the concepts of defensive and offensive realism, as well as of real and of latent (potential) power. The decrease in the influence of the state as the primary actor in international relations, and the increase of influence of new types of actors are shown, including international terrorist networks (led by IS), political parties, media and NGOs in the context of post-modernism, global business structures. At the national level, the main actors are illustrated both by the example of countries with a developed civil society and a market economy, and by that of the traditional non-Western society. The question of levels of analysis in international relations, as well as agent-structure problem are illustrated by concrete cases from modern international relations. The author describes a model of "nested" politics. The main types of models used in international studies (game theoretic, econometric, network analysis, simulation) are indicated as well as their shortcomings. Two kinds of simulation models - system dynamics and agent-based modeling are described. It is noted that the agent-based modeling is carried out mainly in the framework of the constructivist paradigm of international relations theory.

In international relations, international security combines that set of international relations that ensures global stability. In other words, international security is a state in which states are not threatened by war or by any breach of their sovereignty or independent development by other states. In accordance with the UN Charter, the Security Council currently has the main task of ensuring world peace, also having the sole right to impose sanctions against aggressors. The idea of international security, its realization in practice is determined by historical, economic, political, social conditions, as well as other factors. The problem of international security arose with the formation of the state institution, being always close to the problem of war and peace. Over time, there has been a change in the ability to analyze and report security issues. Along with these, both the policies and the security strategies of contemporary societies have undergone a process of metamorphosis.