Russia’s persistent aggression towards its neighbours has long been predicted. However, the 2022 full-scale invasion of Ukraine proved to be a startling development. Even if Ukraine does not belong to NATO or the EU, the Kremlin, either through miscalculation or deliberate intent, ventured into unchartered territory. Similarly, Russia may decide to test NATO’s cohesion. This shift has significantly altered the security landscape for the Baltic states. This article investigates Estonian ideas, plans, and actions aimed at mitigating the escalating risks. In the realm of collective defence, an anticipated transition from deterrence by punishment to deterrence by denial is underway. This transition coincides with a disillusionment with the European common defence policy. While the EU is envisioned to play a pivotal role in non-military domains, Estonia places its exclusive trust in NATO for military defence. Nonetheless, this collective defence approach is not without challenges. Most importantly, deterrence by denial may not be immediately applicable. Consequently, in terms of individual defence, it appears that alongside integrated defence, a total defence strategy is imperative.