摘要 : Southeast Asia is beset by a host of maritime security threats including illegal fishing, piracy, smuggling and environmental crimes. Institutions responding to these issues have proliferated. This article systematically maps and ... 展开 Southeast Asia is beset by a host of maritime security threats including illegal fishing, piracy, smuggling and environmental crimes. Institutions responding to these issues have proliferated. This article systematically maps and demonstrates this new complexity and fragmentation using original empirical data. Focusing on blue crimes rather than territorial disputes, it argues that fragmentation, a non-hierarchical proliferation of arrangements, is a key driver of regional cooperation on maritime security, and that while conflict overlap and duplication are present between arrangements, the development of trust and collective identification between actors is having an overall positive effect on regional cooperation. The article further argues that this emerges from fragmentation in two ways. First, fragmentation creates more opportunities for sustained interaction, which can habituate cooperation due to the expanding web of meetings. Second, fragmentation, when well-managed, exposes an expanding set of actors to these trust-building processes. The article therefore provides new perspectives on regional dynamics and the state of cooperation in the field of maritime security. 收起