Armed conflict does not create a legal vacuum. Two bodies of law operate at once — international humanitarian law, which regulates the conduct of hostilities, and international human rights law, which continues to bind states even in wartime. Understanding how they interact, and what follows when they are breached, is the foundation of every accountability process from a national war crimes trial to proceedings in The Hague.
This article sets out the framework: which rules apply, who bears responsibility, what remedies exist, and why the evidentiary work done during a conflict determines what accountability is possible afterwards.
Key Takeaways
- Human rights law does not switch off in wartime. The International Court of Justice has repeatedly confirmed that it applies alongside humanitarian law, with the latter acting as the more specialised rule on conduct of hostilities.
- Certain rights can never be suspended, including freedom from torture and from arbitrary deprivation of life.
- Responsibility operates on two tracks: state responsibility, which is civil in character, and individual criminal liability.
- Command responsibility means superiors can be liable for failing to prevent or punish crimes they knew or should have known about.
- The International Criminal Court is a court of last resort — it acts only where national systems are genuinely unwilling or unable to.
Concurrent Application of Human Rights Law and IHL
The older view — that human rights law governs peacetime and humanitarian law governs war — has not been the legal position for decades. In its advisory opinions on nuclear weapons and on the construction of a wall in occupied Palestinian territory, and in its judgment on armed activities in the Democratic Republic of the Congo, the International Court of Justice confirmed that human rights obligations continue during armed conflict.
Where the two overlap, humanitarian law generally operates as lex specialis — the more specific rule for the conduct of hostilities. What counts as an arbitrary deprivation of life during active combat, for instance, is assessed by reference to the humanitarian law rules on distinction, proportionality and precautions rather than by peacetime policing standards.
Two structural points matter in practice. First, derogation: human rights treaties permit states to suspend some obligations during a public emergency, but only to the extent strictly required, and never for the non-derogable core — the prohibitions on torture, slavery, retroactive criminal punishment, and arbitrary deprivation of life. Second, classification: the applicable rules differ depending on whether a conflict is international or non-international, with the latter governed principally by Common Article 3 of the Geneva Conventions and, where applicable, Additional Protocol II. Classification is frequently the first contested issue in any case.
State Responsibility for Violations
State responsibility arises where conduct breaching an international obligation is attributable to the state. The International Law Commission’s articles on state responsibility, though not a treaty, are widely treated as reflecting customary law on this question.
Attribution covers the acts of organs of the state, including armed forces, and extends to persons or groups acting on the instructions of, or under the direction or control of, the state. The threshold of control required for attributing the conduct of non-state armed groups has been the subject of significant judicial disagreement, and it remains one of the most litigated questions in the field.
The consequences are cessation of the wrongful act, assurances of non-repetition, and full reparation. Reparation takes three classical forms: restitution where the prior situation can be restored, compensation for financially assessable damage, and satisfaction — acknowledgement, apology, or a declaration of breach — where the harm cannot be repaired materially.
Enforcement runs through several routes: contentious proceedings before the International Court of Justice between states, regional human rights courts which can hear individual applications, and United Nations treaty bodies. Regional courts have developed the most detailed jurisprudence on reparations for individuals, including on the impermissibility of blanket amnesties for grave violations.
Individual Criminal Liability
Alongside state responsibility, individuals bear personal criminal liability for the most serious violations. The principle established at Nuremberg — that crimes are committed by people, not abstract entities — underpins the entire modern system.
The core crimes
- Genocide — enumerated acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group as such. The specific intent requirement makes it the hardest of the core crimes to prove.
- Crimes against humanity — acts such as murder, extermination, enslavement, deportation, torture, sexual violence and persecution, committed as part of a widespread or systematic attack directed against a civilian population.
- War crimes — serious violations of humanitarian law, including grave breaches of the Geneva Conventions, attacks on civilians and civilian objects, and misuse of protected status.
- The crime of aggression — the planning or execution of a manifest violation of the United Nations Charter by a person in a position to control state action, subject to particular jurisdictional restrictions.
Modes of liability
Liability is not confined to those who physically commit acts. It extends to ordering, soliciting, inducing, aiding and abetting, and contributing to a group crime. Command responsibility is particularly significant: a military commander may be criminally responsible for crimes committed by forces under effective control where they knew or, owing to the circumstances, should have known of the crimes and failed to take necessary and reasonable measures to prevent or punish them. Civilian superiors are subject to a related but differently framed standard.
Superior orders is generally not a defence to genocide or crimes against humanity, and official capacity — including head of state immunity before international tribunals — does not exempt a person from criminal responsibility under the Rome Statute framework.
Where cases are heard
The ad hoc tribunals for the former Yugoslavia and Rwanda, and hybrid courts such as the Special Court for Sierra Leone, generated the jurisprudence that the permanent International Criminal Court now builds on. The Court operates on the principle of complementarity: it may act only where a state with jurisdiction is unwilling or genuinely unable to investigate and prosecute.
National courts remain central. States party to the Geneva Conventions are obliged to search for and prosecute or extradite persons alleged to have committed grave breaches, and a number of states exercise universal jurisdiction over international crimes. Prosecutions in national courts of officials from other states, based on evidence gathered by investigators and civil society organisations, have produced significant convictions in recent years.
Documentation, Evidence and Legal Analysis
Accountability is limited far more often by evidence than by law. Cases are built years after the events, from material gathered under dangerous conditions by people who are usually not lawyers.
Contemporary practice rests on a few principles. Chain of custody must be maintained from collection onwards, because material that cannot be authenticated is of limited use however compelling it appears. Open source and digital evidence — satellite imagery, geolocated video, communications metadata — has become central, and there are now recognised methodological standards for collecting and verifying it. Witness protection and the avoidance of re-traumatisation shape what can safely be gathered, particularly in cases involving sexual violence. And pattern evidence matters as much as individual incidents, because crimes against humanity require proof of a widespread or systematic attack, not merely of isolated acts.
United Nations commissions of inquiry and dedicated investigative mechanisms have been established for several situations, with mandates to collect and preserve evidence to a standard usable in future criminal proceedings — an acknowledgement that prosecutions may only become possible long after a conflict ends. Organisations working in this area, including specialist bodies such as thehuman-rights.com, contribute to the documentation base that later prosecutions depend on.
Post-Conflict Accountability and Transitional Justice
Criminal trials are one element of a broader response. Transitional justice is generally understood to rest on four pillars: prosecutions, truth-seeking, reparations, and guarantees of non-recurrence through institutional reform.
Truth commissions can establish a public record and reach far more victims than trials, though their relationship with prosecution is contested where testimony is exchanged for immunity. Reparations programmes — individual and collective, material and symbolic — often matter more to affected communities than distant trials of a handful of senior figures. Institutional reform, including vetting of security forces and judicial independence, addresses the conditions that permitted violations.
Amnesties are the most contested instrument. Regional human rights jurisprudence has held that blanket amnesties for serious violations are incompatible with a state’s obligation to investigate and punish, though tailored arrangements forming part of a negotiated settlement continue to be debated.
Frequently Asked Questions
Do human rights apply during war?
Yes. Human rights obligations continue during armed conflict, with humanitarian law operating as the more specialised body of rules on the conduct of hostilities. Some rights may be derogated from in an emergency; the non-derogable core cannot be.
What is the difference between a war crime and a crime against humanity?
War crimes are serious violations of humanitarian law and require a link to an armed conflict. Crimes against humanity require a widespread or systematic attack against a civilian population and can occur outside armed conflict.
Can a head of state be prosecuted?
Official capacity does not exempt a person from criminal responsibility before international tribunals under the Rome Statute framework. Immunities before foreign national courts raise separate and more complex questions.
Are non-state armed groups bound by these rules?
Common Article 3 and customary humanitarian law bind all parties to a non-international armed conflict, including organised armed groups, and their members can be prosecuted for international crimes.
Is there a time limit on prosecution?
Genocide, crimes against humanity and war crimes are generally treated as not subject to statutory limitation, which is why prosecutions decades after the events remain possible.
Why do so few cases reach trial?
Access to territory, evidence preservation, witness safety, state cooperation and the absence of any international police force all constrain enforcement. The law is generally clearer than the machinery available to apply it.
Conclusion
The legal consequences of violations in armed conflict are well developed on paper: concurrent bodies of law, dual tracks of state and individual responsibility, established crime definitions, and a settled framework of reparation. The persistent constraint is enforcement — which depends on evidence preserved to an admissible standard, on national systems willing to act, and on political cooperation that cannot be assumed. That is why documentation carried out during a conflict so often determines what accountability is possible a decade later.
This article is general information about international law and is not legal advice. This is a fast-moving area with significant ongoing litigation; consult primary sources and specialist practitioners for current developments.
