The Issue of preemptive war and the protection of States against the dangers and threats
they face is a process that facilitates rectifying things and carrying out defensive operations that
gave rise, in turn, to the legal capacity through repeating and stating them in the international
agreements. Self-defense in international law is very similar to the right of defense in the
national laws of states which consider the individual’s protection and survival as having the
priority over the violator or the enemy. In order tackle all the aspects of the topic, the researchers
have tried to divide the study into two main sections. The first section is about the definition of
preemptive wars and the scholars’ opinions through two subsections: the first gives the
definition of pre-emptive war, and the second tackles the requirements and the motivations of
the preemptive war. While the second section which falls in two subsections is related to the
role of the international organizations in defining these wars and their mechanisms. The first
subsection is about the role of the League of Nations, and the second is about the role of the
.United Nations in such wars