Analysts and policymakers alike were largely caught by surprise, if not by the Ukraine crisis itself, then at least by its form and magnitude. The crisis was influenced by various causal factors (both internal and external to Ukraine) and went through different phases (political, economic, military), but by many accounts it was Moscow’s decision to annex Crimea that appears in retrospect to have been the most crucial development. The active use of political, economic and even military levers by Moscow to secure its interests in its immediate post-Soviet neighbourhood does not constitute a new feature in Russia’s post-communist foreign policy. However, the absorption of territory into the Russian Federation does. In that sense, it could be argued that, in analysing Russia’s foreign policy course, the organization of the referendum in Crimea is even more significant than the military manoeuvres deployed to secure the naval base in Sevastopol. It has certainly constituted a thread line for the present volume and a backdrop against which the authors test their hypotheses.