In this article, I raise the question of whether economic sanctions are morally legal. I present the jus ad bellum principles and the Doctrine of Double Effect (DDE) as the theoretical basis for analyzing the ethical foundations of this political instrument. I show that economic sanctions are an instrument of war, that can be morally legitimized through the DDE and the just war principles. Using the example of the EU-sanctions against Russia I show how proponents of the DDE justify the use of economic sanctions and what negative side effects result from their application. From a critical perspective, I want to show that this kind of moral justification is wrong. My critique is based on the assumption that the individual intention of an acting person/government can be misdirected by various external factors. As the groupthink concept illustrates, dissenting opinions are neglected in the consensus-building process. In addition, advisors, experts and employees influence the opinion of government officials to a considerable extent. This leads to the formation of specific moral concepts. This is particularly evident regarding the Russian war of aggression against Ukraine. The Russian government has created its own moral code based on historical events, individual opinions and fantasies of maintaining power. This is contrary to the moral codes of Western states. The difference in moral concepts also results in different intentions to act. These different views make it difficult to evaluate sanctioning procedures as morally good or bad. Consequently, the mere focus on intention is insufficient as an assessment standard for the moral status of an action.