Criminal Diplomacy Without Sovereignty: The Afro-Eurasia Criminal Networks and the Implications on International Security

International relations scholarship remains state-centred despite the growing influence of transnational criminal organisations on cross-border security, political economies, and governance. This article argues that transnational criminal groups develop cooperation strategies functionally analogous to interstate relations. They bargain, exchange information, allocate responsibilities, outsource activities, signal credibility, manage conflict, and exploit territorial and legal differences. The analogy is strategic rather than legal because criminal groups lack sovereign equality and legitimate authority. Using a structured comparative synthesis of recent research on Nigerian confraternities and cyber-fraud networks, wildlife-trafficking networks linking East Africa and Southeast Asia, Chinese organised crime, European drug markets, and the Sinaloa cartel, the article shows that criminal cooperation is typically selective, task-specific, socially embedded, geographically clustered, and brokered through diasporas, businesses, and corrupt officials. It introduces the concept of criminal diplomacy and recommends relational network analysis, transgovernmental investigations, financial-intelligence cooperation, anti-corruption safeguards, and rights-sensitive policing focused on brokers and enabling infrastructures.