This war-like shock will require very large fiscal support. Its financing cost should be distributed over several generations. This can be achieved by issuing irredeemable or very long maturity Eurobonds. They should be backed by the ECB to keep the financing burden low. This column argues that no institutional or legal constraints prevent this policy response. Prompt action is critical since allowing one crisis to morph into many could disrupt the European project, with far-reaching and unpredictable political implications.