The author also sheds light on the utility of mainstream International Relations theories for understanding Japan’s behaviour. How do we understand the policy of a self-declared ‘anti-militarist’ state forced to operate in a realist world and for whom energy supplies are a matter of vital national security? This study shows how neither realism nor its rivals, such as constructivism, can wholly explain Japan’s behaviour and suggests a theoretical framework for doing so. Filling a major gap in our understanding of an increasingly important area of study Japan’s Middle East Security Policy is an essential read for those interested in Japan’s International Relations, Middle East politics, security studies and foreign policy.