Russia’s invasion of Ukraine catalysed a shift in the security and defence policies of the European Union (EU) and its member states. Notably, the deployment of the European Peace Facility (EPF) to finance lethal military materiel for Ukraine has been described as a gamechanger for the EU. This article explores to what extent and how the policy shift regarding the EPF signals broader evolution in EU strategic agency. Contributing to the study of European strategic cultures, the article investigates dynamics of change and convergence in the strategic discourses of the EU and selected member states regarding the EPF amid the exogenous shock and policy shift. Specifically, the article first traces the evolution of the EU’s strategic narrative and its use of the EPF before and after the invasion. Second, drawing on interview data, it analyses four member states’ approaches to this instrument. The findings point to a changed strategic narrative and an evolving practice regarding EU military assistance, highlighting the EU institutions’ initiative-making power in crisis. While the member states continue to use the EPF for varying purposes, the joint experience of using the tool contributed to shifting national perspectives and growing consensus on the utility of EU security agency.