Forum-shifting from above and below: international stratification and the fragmentation of the nuclear non-proliferation regime complex.

Since the adoption of the nuclear Non-Proliferation Treaty (NPT), the order founded on the treaty has evolved into an increasingly fragmented regime complex. Fragmentation has resulted from forum-shifting initiated both at the top and at the bottom of the nuclear hierarchy: both the United States, with varying partners, and coalitions of small-and medium-sized non-nuclear states have repeatedly moved rule-making on nuclear issues to fora outside the NPT, adding partly conflicting institutions to the complex. To understand this dynamic, I propose a sociological perspective that highlights states' positional struggles in a multidimensionally stratified international society. Drawing on Bourdieusian global fields theory, I argue that both dominant and weak states use forum-shifting to manipulate exchange rates between different (material, institutional and social) forms of capital they possess. Thus, they seek to protect their positions in global hierarchies within and beyond the nuclear field when they perceive these hierarchies as being challenged by material or institutional power shifts. [ABSTRACT FROM AUTHOR]