The aim of the article is to analyze security in the Persian Gulf through the prism of the theory of regional security complex. The Middle East is a conflict formation that refers to the model of security interdependence between the countries of the region, which is shaped by the fear of war and expectancy of violence. Distrust and ubiquitous threat prevail in the relations of the Gulf States. In response, these countries form alliances, which creates a security dilemma. In the article I will try to answer the questions: what determinants affect the security of the Gulf States and what role the U.S. play in security issues in the Persian Gulf?