This article leverages Watsuji Tetsurō's idea of aidagara – “inter-relationships” – to better appreciate the interpenetration of space and relationships in Japanese foreign policy narratives. I set Watsuji's philosophical framework against Japanese foreign policy narratives referring to various spaces as a case study to emphasizing the interplay of space and relationships in Japanese diplomatic efforts. On the one hand, we see the Japanese government invoking East Asia, the Asia-Pacific, and the Indo-Pacific as spatial descriptors to conceptualize the political dynamics surrounding them. On the other hand, Japan's relations with its interlocutors reify fluid geographical boundaries as spaces relevant for Japan's foreign relations. Thus, Watsuji helps us to rethink international politics as an aidagara in which the space produces political relationships, while political relationships themselves reproduce, or even redefine, space.
