Abstract: The research focuses on the evolution of transnational organized crime, mechanisms of interaction between criminal structures in these two regions, and the impact of this cooperation on global security. Special attention is given to the analysis of criminal flow convergence, including drug trafficking, money laundering, and arms trade. The study investigates the transformation process of local criminal organizations into global criminal networks, as well as the formation of shadow enclaves in Latin America. The object of research includes specific cases of cooperation between European and Latin American criminal groups, their methods and strategies, and the socio-economic and political factors contributing to the development of this phenomenon. The research employs an interdisciplinary approach, combining methods from criminology, political science, sociology, and economics. Data is sourced from official reports, academic publications, and expert interviews. The scientific novelty of the research lies in its comprehensive analysis of international criminal alliances, viewing transnational organized crime as a complex adaptive system. Key findings include the identification of trends towards the formation of stable transcontinental criminal networks, determination of key factors facilitating this process, and analysis of its impact on regional and global security. The author's contribution is the development of the "shadow enclaves" concept as key nodes in the structure of international criminal alliances. The study also reveals new forms of criminal cooperation, including the symbiosis of terrorism and drug trafficking.The article provides insights for developing more effective strategies to counter transnational organized crime, emphasizing the need for enhanced international cooperation in law enforcement, legislative harmonization, and anti-corruption efforts.