The expanding network of Higher Education and Research facilities through inter-federation, whilst extremely valuable for collaboration and online security at large, exposes an inviting new vector of attack for malicious actors. A single compromised account may provide an entry point to this global network of resources linking thousands of organisations. How can we coordinate a response spanning countries and continents? How can we build trust between organisations in our communities? What lessons can we learn from existing architectures, such as the WLCG? Join us as we explore the practicalities of closing the loop on federated security and discuss the initiatives currently in play.