Mexico
Practice Relating to Rule 158. Prosecution of War Crimes
Mexico’s Army and Air Force Manual (2009) states: “The law of war contains provisions that expressly require States to punish persons under its authority who are responsible for unlawful acts.”
Mexico’s Penal Code (1931), as amended to 2000, under the heading “Offences against the duties of humanity”, provides for the punishment of a number of offences committed against certain protected persons and objects.
Mexico’s Code of Military Justice (1933), as amended in 1996, under the headings “Crimes against the laws of nations” and “Crimes committed in the exercise of military duties or with relation to them” provides for the punishment of perpetrators of a number of offences related to war operations.
In 2007, during the general debate at the 30th International Conference of the Red Cross and Red Crescent, the permanent representative of Mexico stated: “Neither the fight against terrorism nor sectarian antagonism justifies actions in violation of the IHL norms. Their violation must be investigated and punished in accordance with the applicable law and the victims must receive reparation.”
In 2009, during a debate in the UN Security Council on the protection of civilians in armed conflict, the permanent representative of Mexico stated:
We should bear in mind that violations of the norms and basic principles of international humanitarian law constitute war crimes, and that it is the Member States who bear the primary responsibility to investigate and prosecute those allegedly responsible for them. … Should States lack the capacity or willingness to prosecute alleged perpetrators, the International Criminal Court has jurisdiction to take up such crimes, as set forth in the Rome Statute [1998 ICC Statute].
In 2009, during a debate in the UN Security Council on the protection of civilians in armed conflict, the permanent representative of Mexico stated:
When violent acts are committed against civilians and other persons protected in situations of armed conflict, justice must be done in order to put an end to the impunity of the alleged perpetrators of serious crimes or those ordering them to be committed in contravention of international law. The existence of the International Criminal Court and its complementary role vis-à-vis national jurisdictions should not only serve as an incentive to strengthen national justice systems, but also represent an effective mechanism for dealing with crimes when national judiciary structures have disappeared as a result of conflict. That is why it is important to achieve the universality of the Rome Statute [1998 ICC Statute].
In 2009, during a debate in the UN Security Council on the Sudan, the permanent representative of Mexico stated:
The Government of the Sudan is obliged to investigate and prosecute the perpetrators of international crimes committed within its jurisdiction. That is a basic principle of international criminal law and a premise of the system created by the Rome Statute [1998 ICC Statute]. Events since the adoption of [UN Security Council] resolution 1593 (2005) show that, faced with the Government’s inaction, the International Criminal Court should exercise its jurisdiction.
In 2010, in its report to the UN General Assembly on the status of the 1977 Additional Protocols, Mexico stated:
One of the main objectives in the 2010 programme of work of the recently created Inter-Ministerial Commission on International Humanitarian Law (CIDIH), is to review the definition of offences contained in the Federal Criminal Code, in light of the [1998] Rome Statute of the International Criminal Court, the four Geneva Conventions of 1949 and their Additional Protocol I [of 1977], with a view to bringing them into line with international standards.

[footnote in original omitted]
In 2010, during a debate in the UN Security Council on children in armed conflict, Mexico’s Secretary of Foreign Affairs stated:
Serious violations of fundamental principles and norms of international humanitarian law are war crimes, and Member States have the primary obligation to investigate and prosecute those responsible for such violations. …
In cases where States have neither the capacity nor the willingness to prosecute those presumed responsible for these crimes, the International Criminal Court has the power to recognize those crimes that are stipulated in the [1998] Rome Statute.
The Secretary also stated:
Violations of international humanitarian law may be war crimes, and it is States themselves that have the primary obligation to prosecute their alleged perpetrators. If they cannot or are unwilling to do so, the International Criminal Court has jurisdiction to receive such cases. Its existence must not only be an incentive to strengthen national legal systems, but also an effective mechanism for addressing crimes when national judicial structures have been destroyed by conflict.