The EU and NATO not only share three quarters of their membership, since the ushering in of the EU’s Common Security and Defense Policy in 1999, the two organizations’ efforts in crisis management also appear to duplicate each other. This phenomenon is indicative of a broader trend: As international organizations expand in scope and membership, their organizational boundaries begin to overlap. In her article “The politics of overlapping organizations: hostage-taking, forum-shopping and brokering” published in the Journal of European Public Policy, Stephanie C. Hofmann asks how such overlap impacts international organizations’ execution of their mandates. As some states are a member of only one organization whereas others hold dual membership, Stephanie argues that overlap between organizations results in a variety of strategies for governments to pursue their preferences. Organizational overlap accords new veto opportunities to single membership states and empowers them vis-à-vis dual membership states, while the latter can choose the organizational venue that best serves their interests or broker informal solutions, avoiding the procurement of expensive resources and resulting in more coherent multilateral engagement. Stephanie’s analysis of the EU-NATO overlap identifies the United Kingdom as a key broker, often offering informal solutions to alleviate complexities in crises management, which – against the backdrop of the United Kingdom’s nearing exit from the EU – suggests “that with Brexit, informal resource-based solutions will be harder to achieve.”