Objectives:
The full-scale annexation of Crimea and Russia's invasion of Ukraine prompted the political elites of the Baltic states to devote even more attention to security problems and to update the defence plans of the Baltic region. The aim of the work is to analyze the development of the security and deterrence strategies of the Baltic states in the years 2014-2024 in the face of potential Russian threats on the border of the eastern flank of the North Atlantic Treaty Organization. The starting point for the discussion is the hypothesis that the sense of threat from the Russian Federation contributes to the intensification of trilateral military cooperation between Lithuania, Latvia and Estonia. The theoretical basis for the empirical analysis is the adaptive strategy model (so-called grand strategy ) developed by Colin Dueck .

Methods:
case study

Results:
After the annexation of Crimea and the full-scale Russian invasion of Ukraine, the Baltic states were encouraged to tighten strategic trilateral cooperation and develop the potential of their armed forces to increase the ability to defend their own territory, while striving to strengthen collective defence and deterrence within NATO.

Conclusions:
The Russian invasion of Ukraine resulted in active investment in defense in the Baltic states. In Lithuania, Latvia, and Estonia, there is currently strong political will to continuously develop military potential, combined with increased public interest in state security issues.