The aim of this article is to analyze the conflict in Iraq and Syria under both the jus ad bellum and the jus in bello, primarly through the lens of the United States-led coalition. The author argues that coalition operations against Daesh in Syria are based on the right of self-defence and do not violate the provisions of the UN Charter. He then examines various issues pertaining to the classification of the conflict. He also considers the legality of targeting oil production facilities and enemy banking systems. Regarding the use of explosive weapons in populated areas, he argues that a clear distinction should be made between direct attacks on civilians, indiscriminate attacks and the lawful use of explosive weapons.