For decades, actorness has been a much‐debated concept central to the theorization and analysis of the EU's evolution as an international actor. While this concept is often presented as a set of factors, which together shape the EU's capacity to act internationally, the literature displays a surprisingly deficient understanding of how these factors interact in the emergence of actorness. To address this gap, this article theorizes about actorness from an interactionist role theory perspective, which draws on the works of social psychologist George Herbert Mead. In building on this perspective, the article conceptualizes actorness as an entity's capacity to (re)‐imagine and realize roles for its ‘self’ in (specific contexts of) international affairs. This capacity, the approach suggests, emerges in the interplay of (social and material) resources, creative action and (domestic and external) role expectations.

This article argues that interactionist role theory holds much potential for complementing the ontological security literature in the field of International Relations. Concretely, the article argues that an interactionist role theory perspective promises to supplement the ontological security literature in at least two significant respects. First, it allows for a better understanding of how an international actor’s (capacity to provide) ontological security is tied to its ability to realize its ‘self’ in society through the making and playing of roles (and the subsequent casting of others). Second, it emphasizes how reflective intelligence enables an international actor to address destabilizing disconnects between its ‘self’-image and societal role-play, and to develop a measure of ontological resilience (a capacity to constructively engage with – and to recover from – ontological security challenges). To illustrate this argument, the article provides a case study, which explores, from an interactionist role theory perspective, how the European Union’s ontological security has been strengthened, challenged and restored in its interaction with its Southern and Eastern Neighbourhood.

The regional roles external actors play, such as ‘China’s role in Africa’ or ‘the US role in East Asia’, have long been popular subjects of analysis in the international relations literature. Yet, the emergence and evolution of these roles remains remarkably under-theorized. While some ‘new regionalist’ scholars have discussed the dynamics of an external actor’s regional involvement by referring to the concepts of ‘penetration’ and ‘socialization’, neither concept, this article argues, is sufficiently equipped to capture how external actors come to aspire and realize their regional roles. To address this shortcoming, the article employs an interactionist role theory perspective, which draws on the work of social psychologist George Herbert Mead. In following this perspective, the article argues that external actors develop regional role aspirations as they draw on their creativity and reflexivity to overcome experienced uncertainties. To realize these aspirations, the article suggests, external actors seek to cast significant others into corresponding roles. Alter-casting, the article argues in this context, is critical for understanding the (re)constitution of an external actor’s regional role, and thus a region’s social structure.

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