The effectiveness of interregional security cooperation: evaluating the joint engagement of the EU and the AU in response to the 2013 crisis in the Central African Republic

African Union (AU)–European Union (EU) interregional security cooperation has not so far been analysed systematically with regard to its effectiveness despite the substantial support of African capacity building by the EU and joint peacekeeping of the partners. Assessing AU–EU cooperation in the Central African Republic (CAR), this paper examines to what extent and under which conditions EU–AU efforts are effective. Concerning the dependent variable, the presented conceptualisation of effectiveness includes both internal (goal attainment) and external (problem-solving) perspectives. The independent variable draws on two strands of literature that barely speak to each other: interregionalism and inter-organisationalism. It focuses on the conditions of effectiveness which include both internal (RO-specific) and interregional factors. The findings suggest that AU–EU engagement in the CAR was effective in the medium term. Strong incentives of the partners, the French leading role and the convergence of the partners are identified as factors conducive to a medium to high effectiveness of the engagement.