Few maritime security environments across the globe have consistently shown a degree of tension and volatility akin to the Baltic Sea scenario. Having established the deterrence of Russia's ambitions as an emphasis of European defence, the increase in military investments within the region, as well as the political realignments across the Baltic shore after the invasion of Ukraine show that the security assessment has radically changed in the last few months. The current deployment of NATO and Russian Federation forces in this region, along with the Alliance's geopolitical developments, provides a valuable perspective for analysing defence planning and assessing present and future vulnerabilities and areas of risk. The Baltic security architecture, and its continuous updates and transitions, justifies an integrative reading into the key aspects of the present security challenges in the area.