The goal of the project is to foster the understanding of ritual action in international politics through the case of deterrence. The RITUAL DETERRENCE project investigates deterrence through the lens of ritual theory, to understand its political and psychological effects in international relations. It explores the role of ritual action in making deterrence effective, affectively charged and credible in the eyes of its practitioners. Empirically, the project pursues systematic cross-cultural and cross-domain research on deterrence as a multi-modal social practice. The research will be based on a set of in-depth qualitative case studies investigating historical and contemporary contexts: nuclear deterrence in NATO-Warsaw Pact relations during the Cold War, NATO-Russia deterrence dynamics in the post-Cold War era; Russian deterrence in the maritime realm and the grey zone; USA-China deterrence relationship in the post-Cold War era, and memory-political deterrence in Eastern Europe. In delivering a new description of the practice of deterrence and an overhaul of the theory of deterrence, the project seeks to offer a comprehensive rethinking of the performance, credibility and the presumed effect of deterrence. Tracing and historicising the interaction ritual chains of deterrence will generate crucial knowledge about how deterrence performances enact and legitimise political communities. The RITUAL DETERRENCE project aims to provide a systematic, sociological and comparative research on deterrence as a social practice across different dimensions (military, political-diplomatic, legislative) and types of deterrence (conventional, nuclear, cyber, hybrid, legal) on crucial contemporary (NATO-Russia, US-Russia, US-China; memory laws in Eastern Europe) and historical cases (NATO-Warsaw Pact). The study combines discourse and practice analysis with expert interviews, participant observation of military exercises and wargaming, encompassing both direct and extended deterrence along traditional and emerging domains of deterrence. Data will be collected through in-depth interviews with experts and practitioners (diplomats, military, and policy-makers). There will be (participant) observation of summits and bilateral meetings, large-scale military exercises, public ceremonies, force posture shifts, military training and war simulations, and content analysis of contextual data. In addition, there will be discourse analysis of pertinent documentation, debates and archival evidence.