The crime of aggression is one of the most serious acts committed by one State against another because it affects the right to self-determination and sovereignty of the State concerned, and by means of force, is it making major infractions against the international law and world peace. Now, the crime
of aggression has had slow development by the international community due to political and economic pressure exerted by influential countries as usa, Russia, China, England and France. These countries have cunningly established definitions and resolutions as in the 3314 un Resolution of 1974. The international community has repeatedly sought to provide a definition binding on states and individuals who commit this type of crime, besides the sanctions —impossible yet— for the commission of this international offense. However, only until the First Review Conference of States Parties to the Rome Statute of the International Criminal Court, held in Kampala, Uganda in 2010, achieved a historic-agreed-upon definition of the crime of aggression and the competence of his prosecution by the International Criminal Court, which is expected to enter into force after thirty States Parties ratify the amendment to Art. 8(1) bis of this Statute. The journey to get to this definition has not been easy or simple, first of all by the veto of the permanent members of the Security Council to see limited the still-questioned right to use force as is established in Chap. VII of the un Charter. Therefore, this work aims to develop the following question: Will the new definition of the crime of aggression affect the powers of the Security Council under Chapter VII of the un regarding the sanctions imposed to some States?