The Denial of Rival Influence

This chapter argues that major powers frequently intervene in civil wars not only to expand influence but also to deny rivals a foothold in strategically important regions. It situates this claim within realism and liberalism, showing that strategic denial aligns most closely with defensive realist logic. The chapter develops a typology of denial, direct military action, indirect assistance through local partners, and minimal or diplomatic engagement, and explains variation by the intervener’s perceived interests. Where critical assets or allies are at risk, denial tends toward direct force; where interests are moderate, it relies on proxies; where stakes are low, it remains largely diplomatic. The framework assesses interests along four dimensions, historical ties, strategic assets, economic stakes, and diplomatic significance, and applies this lens to interventions in Syria, Libya, Yemen, and Sudan. By focusing on the blocking of rival gains as a primary objective, the chapter clarifies why interventions that appear inconsistent under expansion-focused theories follow a coherent pattern once denial is made explicit.