The introduction of the euro (exactly twenty years ago as Greece’s currency) was presented as a big promise of economic convergence and well-being, in the spirit of the even bigger promise of permanent peace in the European continent. However, as is all too evident by now, the euro was instrumental in dividing rather than uniting Europe, and it put in action centrifugal forces that undermined unification – a prerequisite for a common European foreign policy and defense policy. Today, in the context of the biggest military conflict on European soil since decades, a critical re-evaluation of the twenty-year-long history of the common currency is more urgent than ever.