Abstract: | This article examines the phenomenon of overlapping regionalism in South and Southeast Asia. Theoretically it rests on Thomas Pedersen’s ‘ideational-institutionalist realism’ approach. We argue that in the two sub-regions under study the proliferation of regional organizations has been greatly stimulated by hegemonic and counter-hegemonic dynamics involving Asia’s largest powers, China and India. We claim that sceptical world views highlighting vulnerability, victimization and national survival are deeply entrenched in the mental maps of the regions’ foreign policy elites. Regional institution building is thus informed by the tenets of realism. We trace how and why China and India seek to establish ‘cooperative hegemonies’ by building regional institutions for incorporating their neighbours into their sphere of influence while keeping rival powers at bay, and also show why smaller states in the region join these regional fora. |