ENThe Baltic Sea region is a very interesting region from the security point of view as the countries within it are very interconnected institutionally and economically. It might be argued that this region represents a classic security complex case, which, according to the Copenhagen school, is distinguished by high levels of interdependence in various domains and, most importantly, in primary national security concerns. Security of these states cannot be addressed independently.1 Most of the sates in the region are also small states and possess limited resources to enable them to strive in international politics and protect them from external threats. Small states are more vulnerable to systemic instabilities than the large and medium powers. Moreover, the security environment in the Baltic Sea region is aggravated by the presence of a large revisionist power, which possesses vast military capabilities and the political will to use them. These characteristics play the main role in the security and defence policies of the states in the region. [...].