a politics and international studies (spais), Faculty of social sciences and Law, school of sociology, university of Bristol, Bristol, uK; b department of Geography, university of california, Los angeles, ca, usa ABSTRACT This article outlines how a materialist understanding of foreign policy predicated on contrasting sovereignty regimes might be applied to current conflicts between China and the United States and its allies in the South China Sea. A stark divergence between liberal and realist commentary, policy prescriptions, and policy practices has emerged in both China and the United States. We provide a critical overview of the dispute before arguing that these disparities are, at root, symptoms of a material contradiction between the benefits and risks of economic interdependence and territorial expansionism. These symptoms are consequently founded upon a realworld paradox, refracted through fundamentally different modalities of practicing state sovereignty, and will ultimately be resolved politically. An intensification of interstate rivalry is fast becoming the outcome of a period of unprecedented economic interconnectedness, to which these variegated sovereignty regimes are contributing.