Sharing a border with Russia has always been a major cause for concern for Baltic countries. However, the fear of a potential invasion from Moscow has strongly increased in the past decades, due to a multitude of factors: Russia’s militarisation policies and the illegal annexation of Crimea. This paper aims to assess the key threats to the Baltic states coming from Russia. It will also look at the way the Baltic states, Estonia, Latvia, and Lithuania have reacted – both autonomously and supported by the international organisations they are part of –, and the necessary issues that must be addressed in the future…