Legitimate defense against terrorist groups in the territory of a foreign government

Jurists consider the most important achievement of the United Nations Charter to be "prohibition of resorting to force" based on Article (4) 2 of the Charter. The only exception provided in the Charter is the use of force under Article 51 in the framework of "legitimate defense". At the same time, some believe that customary international law also recognizes the right to self-defense against an imminent attack. After the September 11 incident and the spread of the cross-border threat of terrorism, some countries try to assign the title of terrorist to their opposition groups and resort to force against these groups even in the territory of other countries. A group of jurists presented the theory of "preventive legitimate defense" in the form of an expanded interpretation of Article 51 of the Charter to deal with non-urgent terrorist threats. The question is, can this theory be defended according to the procedure and principles and methods of legal interpretation? The answer is that interpretative theories do not support this legal approach, and no unified practice has been developed to support this theory by governments or international institutions; But this assessment does not mean ignoring the necessity of providing a legal solution to fight terrorism. The possibility of legitimate defense against terrorist acts in the territory of a state that has effective support is certain, and it can be defended in the territory of a state that has general support. Also, according to the procedure of the Security Council and some governments, l