Ukraine and the opportunity costs of military aid

Abstract Western states have provided billions of dollars of military aid to Ukraine to help it in its war against Russia. Yet, despite numerous discussions of the ethical issues raised by the war, there has been little discussion of the opportunity costs of this military assistance. Is it right that the West has prioritized military assistance to Ukraine, when the conflict in Ukraine is just one of numerous challenges facing the world, from forced displacement to global poverty, preventable disease to climate change? This article offers the first detailed engagement with this issue, taking seriously the nonideal feasibility constraints that states face. It firsts set out the prima facie case against assisting Ukraine militarily due to the opportunity costs. It then explores—and largely rejects—two responses: that military assistance is required to protect Ukrainian self-determination and that it is needed to stop the march of authoritarianism. It argues that the opportunity costs objection has serious force and counts against much of the provision of military assistance to Ukraine (although not all). This argument has broader implications for the extent to which states should prioritize military aid over other means of addressing global challenges.