“Hague war crimes” is the common shorthand for the offenses tried at the International Criminal Court in The Hague: war crimes, genocide, crimes against humanity, and the crime of aggression, all defined by the Rome Statute that created the court in 2002. The ICC has 125 member states, no police force of its own, and jurisdiction only when a national court will not or cannot prosecute. Everything else about how these cases move, or fail to move, follows from those three facts.
The Four Crimes the Court Prosecutes
The Rome Statute gives the ICC authority over four categories of offense. Genocide and crimes against humanity have their own definitions in the statute. War crimes and the crime of aggression are the two categories where the technical rules matter most for understanding what actually gets charged.
War Crimes Under Article 8
Article 8 of the Rome Statute defines war crimes across two settings: international armed conflicts between countries, and internal armed conflicts within a single country. The prohibited conduct falls into recognizable groups.
Attacks on people are the core. Deliberately killing civilians or people who have surrendered is the clearest violation. Torture, biological experiments, and intentionally causing serious injury to people no longer fighting all qualify, as does taking hostages, unlawfully detaining protected persons, and forcing prisoners of war to serve in the enemy’s military. Deliberately targeting a civilian population is a standalone offense, separate from the killing prohibition.
Sexual violence is explicitly listed. Rape, sexual slavery, forced pregnancy, and enforced sterilization committed during armed conflict are war crimes under the statute. The ICC’s 2019 conviction of Bosco Ntaganda included sexual violence committed against child soldiers within his own armed group.
Methods and weapons are restricted. Directing attacks against hospitals, religious buildings, schools, and historic monuments is prohibited unless those sites are actively serving a military purpose. Deliberately starving civilians by cutting off food, water, or other essentials is a distinct crime. Poison, asphyxiating gases, and expanding bullets are banned. Wanton destruction of property without military justification is itself a war crime; Ahmad Al Faqi Al Mahdi received a nine-year sentence purely for destroying historic and religious monuments in Timbuktu, Mali.1International Criminal Court. Cases
The Crime of Aggression
The ICC’s jurisdiction over aggression began on July 17, 2018, following amendments adopted at the 2010 Kampala Review Conference. Aggression means a state leader planning or launching an armed attack against another country’s sovereignty or territorial integrity in clear violation of the UN Charter. Only someone in a position to direct a country’s political or military action can be charged. Lawful self-defense and Security Council-authorized military action are excluded.
When the ICC Can and Cannot Act
The court cannot open a case anywhere in the world against anyone. Several hard limits determine which situations it can reach.
National Courts Come First
Under Article 17, a case is inadmissible if the country with jurisdiction is genuinely investigating or prosecuting it.2Office of the United Nations High Commissioner for Human Rights. Rome Statute of the International Criminal Court The ICC is a court of last resort, stepping in only when a national system is unwilling or unable to act. A sham proceeding designed to shield someone does not block ICC jurisdiction.
Territory, Nationality, and Security Council Referrals
The court can prosecute crimes committed on the territory of any of the 125 member states, whatever the suspect’s nationality. It can prosecute nationals of member states for crimes committed anywhere. A non-member country can voluntarily accept jurisdiction over a specific situation by filing a declaration with the court’s registrar.3International Criminal Court. Rome Statute of the International Criminal Court When the UN Security Council refers a situation, the territorial limits fall away entirely; that is how the Darfur situation reached the ICC despite Sudan not being a member.
Only Crimes After July 1, 2002
The ICC cannot reach anything that happened before July 1, 2002, when the Rome Statute entered into force.4International Criminal Court. About the Office of the Prosecutor and How the Court Works For countries that joined later, jurisdiction begins on the date their membership took effect. For the crime of aggression, the start date is July 17, 2018.
What the ICC Is Not
Two clarifications worth making. The International Court of Justice, also in The Hague, is a separate body that hears disputes between countries; it does not try individuals.5International Court of Justice. The Court And the United States is not a member. It signed the Rome Statute in 2000, never ratified, and later withdrew the signature.6International Criminal Court. The States Parties to the Rome Statute The 2002 American Servicemembers’ Protection Act bars nearly every form of U.S. cooperation with the court, prohibits ICC investigative activity on U.S. soil, and authorizes the President to use “all means necessary and appropriate” to free U.S. or allied personnel held by the court.7Office of the Law Revision Counsel. 22 USC Chapter 81 Subchapter II – American Servicemembers Protection The U.S. has also signed bilateral immunity agreements with roughly 97 countries to prevent surrender of American nationals.
How a Case Starts
Article 13 of the Rome Statute recognizes three ways a situation can reach the Prosecutor.2Office of the United Nations High Commissioner for Human Rights. Rome Statute of the International Criminal Court
- A member state can refer a situation on its own territory or involving its nationals.
- The UN Security Council, acting under Chapter VII of the UN Charter, can refer a situation regardless of whether the country involved has joined the Rome Statute.
- The Prosecutor can open an investigation independently based on information from any source, subject to Pre-Trial Chamber authorization before a full investigation proceeds.
Once an investigation identifies a suspect, the Prosecutor applies to the Pre-Trial Chamber for an arrest warrant under Article 58. The judges must find reasonable grounds to believe the person committed a crime within the court’s jurisdiction, and that arrest is necessary to secure their appearance, prevent obstruction, or stop ongoing crimes. Reasonable grounds is a lower bar than conviction but requires more than speculation. If a summons alone would ensure appearance, the chamber may issue that instead. A warrant stays in force until the court orders otherwise.
Why So Many Warrants Never Lead to a Trial
The court’s biggest structural weakness is that it has no way to enforce its own warrants. Article 86 obligates member states to cooperate fully with investigations and comply with requests for arrest and surrender.8United Nations. Rome Statute – Part 9 International Cooperation and Judicial Assistance Cooperation is inconsistent in practice.
Former Sudanese President Omar al-Bashir is the standard example. He had outstanding ICC warrants from 2009 and 2010 for genocide and war crimes in Darfur and traveled to multiple member states, including Jordan, South Africa, and Kenya, without being arrested. The Appeals Chamber eventually ruled that Jordan had violated its obligation by failing to arrest him during a 2017 visit. When a member state refuses to cooperate, the court’s only real tool is a formal finding of non-compliance, which it can refer to the Assembly of States Parties or the Security Council. Neither body can compel action.
Recent high-profile warrants have not changed that pattern. In March 2023, the ICC issued a warrant for Russian President Vladimir Putin for the war crime of unlawful deportation and transfer of children from occupied areas of Ukraine.9International Criminal Court. Situation in Ukraine – ICC Judges Issue Arrest Warrants Against Vladimir Vladimirovich Putin In late 2024, the court issued warrants for Israeli Prime Minister Benjamin Netanyahu and former Defense Minister Yoav Gallant for the war crime of starvation as a method of warfare and crimes against humanity including murder and persecution, related to conduct in the State of Palestine beginning October 8, 2023.10International Criminal Court. Situation in the State of Palestine – ICC Pre-Trial Chamber I Rejects State of Israel’s Challenges Neither Putin nor Netanyahu has been surrendered.
What Happens If a Suspect Is Surrendered
When a suspect reaches the court, proceedings move through set stages. The person first appears before judges who confirm identity, explain the charges, and ensure the accused understands their rights. A confirmation of charges hearing follows, where the Pre-Trial Chamber decides whether the evidence establishes substantial grounds to believe the person committed the alleged crimes.11International Criminal Court. Duterte Case – Confirmation of Charges Hearing to Open on 23 February 2026 If the charges are confirmed, the case goes to a Trial Chamber, where both sides present evidence, call witnesses, and make legal arguments.
Under Article 77, a conviction can carry up to 30 years in prison, or life imprisonment when justified by the extreme gravity of the crime. The court can also impose fines and order forfeiture of assets derived from the crime.12United Nations. Rome Statute – Part 7 Penalties There is no death penalty. Sentences are served in countries that have volunteered to accept convicted persons. Under Article 110, the court reviews the sentence once the person has served two-thirds of the term, or 25 years of a life sentence, to determine whether a reduction is warranted.
Both sides can appeal under Article 81 on grounds including procedural error, error of fact, and error of law; a convicted person can also appeal anything affecting the fairness or reliability of the proceedings.13United Nations. Rome Statute – Part 8 Appeal and Revision Article 84 allows revision of a conviction if new evidence surfaces that would likely have changed the verdict, if key trial evidence turns out to have been forged, or if a judge who participated in the conviction committed serious misconduct.
Victims and Reparations
The Rome Statute gave victims a role earlier international tribunals did not. Under Article 68, victims can present views and concerns when their personal interests are affected, participating through their own legal representatives rather than only as witnesses. The court’s Victims and Witnesses Section provides protective measures.
After a conviction, the court can order reparations under Article 75 in three forms: restitution, compensation, and rehabilitation. These orders can be directed against the convicted person or channeled through the Trust Fund for Victims, created in 2004 by the Assembly of States Parties.14International Criminal Court. Trust Fund for Victims The Trust Fund both implements court-ordered reparations and provides physical, psychological, and material support to victims independently of any specific conviction.
What Convictions Have Looked Like
A few cases show what the ICC’s finished work actually produces. Bosco Ntaganda, a militia leader in the Democratic Republic of the Congo, received the court’s longest sentence to date: 30 years for 18 counts of war crimes and crimes against humanity committed in 2002 and 2003, including murder, rape, sexual slavery, and conscripting child soldiers.15International Criminal Court. Ntaganda Case Ali Muhammad Ali Abd-Al-Rahman received 20 years for war crimes and crimes against humanity in Darfur. Al Hassan Ag Abdoul Aziz, convicted for crimes in Timbuktu, received 10 years, later reduced by 12 months on appeal. The gap between the pending warrants that draw global attention and the smaller number of completed trials is the clearest picture of how the ICC works, and where it depends on someone else to act.