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Regional conflicts increasingly require multilevel efforts by regional, subregional, and international actors. When states are confronted with a cooperation problem, often there are several institutions available to address this issue. Drawing on the literature of overlapping regionalism and forum-shopping, we argue that existing explanatory models benefit from adding power-based explanations. By conceptualizing an issue-specific dimension and factors specific to the national environment as additional power-based criteria for forum-shopping, we expand the existing literature. Applying our framework to the response to the Boko Haram uprising, our study examines why Nigeria preferred specific regional entities to others. We find that Nigerian resistance toward external intervention and hegemonic interests inherent in national elites as power-based aspects of forum-shopping explain the counterintuitive creation of the Multinational Joint Task Force (MNJTF) under the umbrella of the rather unknown Lake Chad Bassin Commission (LCBC) instead of reliance on the Economic Community of West African States (ECOWAS) or the African Union (AU) as important security providers in Africa.

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In January 2020, Eritrea, Ethiopia, and Somalia proposed to form a new regional bloc, occasionally referred to as the Horn of Africa Cooperation (HoAC). This article assesses which factors have contributed to making this proposal and contemplates potential effects for the complex security challenges, political tensions among the neighbours, and existing institutional environment in the region. Drawing on the scholarship on comparative regionalism and overlapping regionalism, we show that a genuine interest to independently address security challenges in the Horn of Africa, as well as domestic concerns, are core motivations for the leaders in all three states. However, the HoAC proposal bears the risk of further alienating partners in the region and undermning security efforts of other regional organisations, most importantly the Intergovernmental Authority on Development, the African Union, and the Eastern Africa Standby Force. Thus, the promises and pitfalls of this new bloc could shape the regional architecture and cause new political challenges in the region.

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