Terrorism in today's world is known as one of the main factors of chaos. Some countries are trying to achieve their goals by using this phenomenon as a tool. In this regard, the unprecedented order and the official announcement of the assassination of internationally supported persons, including the commander of the Quds Force, by the President of the United States of America, is an example of a crime that violates treaties, customary rules, and international legal principles, and its new forms, which are carried out by the heads of other countries. It is imitative, it threatens the peace and stability of the world community. Considering that the terrorist act was committed in the territory of a foreign country under the supervision of foreign nationals, the victim country is not easily able to prosecute the perpetrators and supervisors of that incident. This is because the terrorist act took place outside the territory of the Islamic Republic of Iran and the principle of territorial jurisdiction, which is the basis for determining the competent courts and recognizing the laws governing them, is not applicable. Invoking pre-emptive defense by the US lacks the necessary elements to attribute the act to Iran. Resorting to force is prohibited in international law, and states have the right to legitimate defense only when they are attacked by armed forces; recognized; Therefore, America's action is in direct opposition to Article 51 of the Charter and has no consistency with other international principles. Strategies such as applying the principle