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The renewed emphasis on national political boundaries across Europe would seem to go hand-in-hand with a weaker external personality for the EU. However, there are several prominent examples of EU leadership that challenge this notion, from the December 2015 UN climate change agreement to common sanctions again Russia to a new Global Strategy. This paper examines a policy area that lies at the intersection of populist outrage and external engagement: counter-terrorism. In the wake of the 2015 and 2016 Paris and Brussels terrorist attacks, the EU has made significant strides in enhancing the external dimension of its counter-terrorism policies, particularly in terms of intelligence sharing, formal and informal diplomacy, and the internal–external nexus of security. The article argues that major terrorist attacks in 2015–2016 have served as critical junctures of crisis, driving counter-terrorism policies forward and emphasising the notion of European boundaries beyond any functionalist or securitization explanation