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              Congressional_______
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War Crimes: A Primer



Updated February 2, 2024

The Russian invasion of Ukraine and the Israel-Hamas conflict have given rise to numerous accusations
of war crimes. This Legal Sidebar addresses the sources and content of the law of war, also known as the
law of armed conflict or international humanitarian law (IHL) as it pertains to war crimes that occur in an
international armed conflict. IHL applies to the conduct of war; it does not address the legality of a war.


Sources of International Humanitarian Law

IHL is a combination of international treaties and customary international law. The Hague Convention of
1907 generally prescribes rules of conduct for armed forces, while the Geneva Conventions and Protocol
Additional to the Geneva Conventions of 12 August 1949, and relating to the Protection of Victims of
International Armed Conflicts 1 (Protocol 1) address the rights of protected persons, such as civilians and
prisoners of war, in an international armed conflict (i.e., a war between or among states). Non-
international armed conflicts are governed by Article 3 Common to the Geneva Conventions (Common
Article 3) and the Protocol Additional Relating to the Victims of Non-International Armed Conflicts
(Protocol 2). A non-international armed conflict under Common Article 3 is an armed conflict that takes
place in the territory of one of the High Contracting Parties, but the requirement has been understood to
cover armed conflicts that take place on more than one territory but involve non-state actors-an
understanding confirmed by the U.S. Supreme Court in the context of the armed conflict involving Al
Qaeda and its associated forces. Because Gaza is not part of a state, it is unclear whether the Israel-Hamas
conflict is an international (potentially involving an occupied territory) or non-international armed
conflict. In addition, not all states are parties to these and other treaties pertaining to the law of war, but
many treaty provisions are regarded as reflecting customary international law, which is binding on all
states.


Principles of International Humanitarian Law

Certain principles undergird IHL and form the basis for the content of war crimes and serve to reduce
unnecessary suffering during war. The most important principles are military necessity, humanity, and
honor. The principles of distinction and proportionality flow from the first three. The Department of
Defense's Law of War Manual describes their interaction as follows:


                                                                Congressional Research Service
                                                                  https://crsreports.congress.gov
                                                                                    LSB10709

CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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