http://dx.doi.org/10.59704/67d0cafc05892904 https://verfassungsblog.de/european-defence-union-intergovernmental/ Pioneers Wanted - On the Differentiated Integration Pathways Towards a Genuine European Defence Union Blockmans, Steven Meijer, Karsten eng 2026-04-28 electronic resource text/html ddc:342 CFSP CSDP Enhanced Cooperation European Defence Union PESCO Verfassungsblog Verfassungsblog--2366-7044 CC BY-SA 4.0 With full-scale war on the European continent and doubts about US support, the EU still treats this existential security crisis like a regular bureaucratic undertaking. It is against this backdrop that Commissioner Kubilius is expected to engineer a genuine European Defence Union – and in our view, raising the right legal questions amounts to answering them: differentiated integration, pursued by a core group of willing member states, is the way forward.