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The Russian invasion of Ukraine has brought war back to the European continent and led to considerable change in EU member states’ foreign policies. The consequential degree of EU foreign policy unity, as well as shifts in long-lasting national and collective security and defence taboos, has represented a significant departure from past practices. We use these processes of change as a starting point to set the scene for this special issue and to inform its main research question: in what manner, if at all, has the EU come of age as a foreign and security actor during Russia’s war on Ukraine? This introduction situates the main question of the special issue into the wider scholarly debates on actorness and the EU’s geopolitical ambitions. It conceptually develops the analogy of “coming of age” to examine a prospective maturation process of the EU as a foreign and security actor. In doing so, it not only interrogates what the EU as a mature foreign and security actor would look like, but it also develops the framework, identifies four maturation processes and reflects on necessary caveats for drawing inferences about the state of maturation of the EU as foreign and security actor.