Subregional cooperation of the countries of the European Union acquires special significance in the context of the formation of a new European reality. The emergence of new threats to security, difficulties in the internal processes of the EU stimulate individual states of the united Europe to group themselves into small associations to protect their own interests, which may not be a priority for Brussels. The article examines some of the subregional groups that exist within the EU: Benelux, the Nordic Council, the Visegrad Group, the Baltic Assembly, the Central European Initiative, the Weimar Triangle and the Slavkov interaction (Austerlitz format). The authors attempted to typologize subregional associations according to the principle of...