Introduction: resilient states versus resilient societies? Whose security does the EU protect through the Eastern Partnership in times of geopolitical crises?

The European Union (EU) is making strong inroads into areas of security traditionally reserved to states. Security concerns are increasingly triggered by fundamental challenges, such as terrorism, climate change, migration, and many other 'soft security issues'. Resilience has become a term of reference in the EU's official foreign policy discourse, triggering an associated 'resilience. Our contribution aims to analyse the 'many faces of resilience' in the EU's Eastern Partnership (EaP) in relation to how the EU understands and seeks to enhance European security, mapping the different meanings the terms assume in the EU's discourses and policy practices, and how they are related to one another. The Russian invasion of Ukraine in February 2022 has largely been viewed as an extraordinary resilience test for the EU and has brought back fundamental concerns on European security, including 'hard' military security issues. This has in turn raised questions not only on how the EU can ensure the resilience of its eastern partners and of itself, but also on the EU's role in a rapidly changing global context of polarisation and fragmentation. In light of these challenges, the contributions to this special issue have only increased in relevance, pointing to pathways and opportunities for how the EU may reconcile the contradictory demands of fostering security and resilience for states and societies alike.