Germany Faces ICJ Scrutiny Over Genocide Complicity Through Arms Exports to Israel

The International Court of Justice is currently grappling with a question that has long lingered in academic discourse: can a state become legally responsible for genocide simply by selling weapons to another state that commits it? The case of Nicaragua v. Germany, filed in March 2024, marks the first time the limits of the complicity doctrine under the Genocide Convention have been tested in such detail before the world’s highest judicial body. At its core lies the legality of German arms exports to Israel and whether those transfers violate obligations under both the Genocide Convention and the Arms Trade Treaty.

The Legal Framework: Complicity Under the Genocide Convention

Article III(e) of the Genocide Convention makes complicity in genocide a punishable act, alongside genocide itself, conspiracy, incitement, and attempt. However, the convention does not define “complicity.” The International Court of Justice addressed this gap in its 2007 judgment in the case between Bosnia and Herzegovina and Serbia. There, the Court held that state complicity in genocide should be interpreted in light of the customary international law of state responsibility, particularly Article 16 of the International Law Commission’s Articles on State Responsibility, which deals with aid or assistance in the commission of an internationally wrongful act.

Applying that standard, the Court acknowledged that Serbia had provided financial and military support to Bosnian Serb forces that committed the Srebrenica massacre. Yet it found no proof that Serbian organs were aware of the genocidal intent at the time the aid was provided. The key requirement, the Court stressed, is that the assisting state must have knowledge of the principal’s genocidal intention. Critically, complicity does not require the same genocidal intent on the part of the assisting state—only awareness.

This knowledge-based standard is pivotal for any future instance of arms exports. The legal issue is not whether the exporting state intends for genocide to occur, but whether it has actual knowledge of the ongoing or imminent genocide at the time of authorization.

The Arms Trade Treaty Adds a Second Layer

Beyond the Genocide Convention, the 2013 Arms Trade Treaty imposes additional obligations on its 115 state parties. Article 6(3) of the ATT prohibits the authorization of conventional arms exports if the exporting state knows, at the time of authorization, that the weapons are likely to be used for perpetrating genocide, crimes against humanity, grave breaches of the Geneva Conventions, or serious violations of international law. Article 7 goes further, requiring an exporting state to conduct a risk assessment before each export to evaluate whether the items could be used to commit or facilitate serious violations of international humanitarian or human rights law. If the risk cannot be mitigated, the export must be refused.

The threshold under the ATT is significantly lower than under the Genocide Convention. It does not require an ongoing genocide; rather, it requires a risk that the weapons will be used in the perpetration of such violations. This risk-assessment obligation creates a continuous duty of diligence for arms-exporting states.

The Nicaragua v. Germany Case

Nicaragua’s application to the International Court of Justice in March 2024 alleges that Germany violated both the Genocide Convention and the Geneva Conventions by authorizing arms exports to Israel and by suspending contributions to the United Nations Relief and Works Agency for Palestine Refugees. Nicaragua pointed to the Court’s January 2024 provisional measures order in the South Africa v. Israel case, which found that there is a “plausible risk” of genocide against Palestinians in Gaza.

Nicaragua requested the Court to order Germany to immediately suspend arms supplies to Israel. In April 2024, the Court declined to issue such provisional measures. However, it did not reject the claim outright. Notably, the Court emphasized a special obligation on all states—including Germany—regarding arms shipments to parties in an armed conflict, to prevent their possible use in violation of the Geneva Conventions. This caveat, unique among orders that otherwise denied interim relief, has had tangible effects.

Since the Court’s order, German arms export approvals to Israel dropped sharply in 2025, only to pick up again in 2026. The German government has been compelled to explain to its own legislature and to the Court both the quantities and types of equipment approved. Germany has moved for dismissal of the entire case on preliminary objections, arguing that Nicaragua failed to exhaust procedural requirements under the Genocide Convention and that much of the claim falls outside the temporal scope of Germany’s acceptance of the Court’s jurisdiction. A judgment on these preliminary issues is expected within the next year; a final decision on the merits is not anticipated before the end of the decade.

Prevention vs Complicity: Two Distinct Obligations

The litigation in Nicaragua v. Germany has blurred two distinct obligations under the Genocide Convention. The first is the prohibition on complicity, which requires proof of knowledge of genocidal intent at the time assistance is rendered. The second is the obligation to prevent genocide, imposed on all state parties regardless of whether they are directly assisting the perpetrators. This prevention obligation requires states to use all means reasonably available to them once they become aware—or should have become aware—of a real risk of genocide.

For an arms-exporting state, this distinction is critical. It may violate the prevention obligation without ever breaching the complicity obligation if it continues to conduct ordinary arms trade after the risk becomes evident, including after plausibility findings by the International Court of Justice in cases where it is not a party. This practical difference explains why advocacy campaigns targeting third states in relation to the Gaza conflict rely heavily on the prevention obligation and the risk-assessment provisions of the Arms Trade Treaty.

Broader Implications for Arms Exporting States

The significance of the Nicaragua v. Germany case extends far beyond the specific conflict in Gaza. Any state that supplies arms to a party in an ongoing armed conflict where credible international organizations warn of a high risk of genocide or serious humanitarian law violations now faces the same legal dilemma: when does a continuation of existing arms trade in the light of such a risk become unlawful, rather than merely a policy choice?

This question is already being considered in domestic courts around the world. Individual export licenses and component approvals are being challenged on the ground that governments have failed to conduct the necessary risk assessments required by the Arms Trade Treaty or analogous domestic regulations. The core legal issue—whether continued arms supplies amount to complicity or a failure to prevent—will have to be determined on the facts of each case by the competent judicial bodies.

What the pending proceedings have already accomplished is to move the complicity doctrine of Article III(e) out of the seminar room and into the courtroom. Arms-exporting states can no longer regard that doctrine as a settled academic concept from 2007. The International Court of Justice’s scrutiny of Germany’s conduct sets a precedent that will reverberate across future conflicts, forcing governments to reassess their legal obligations when licensing arms exports to states with questionable human rights records or active hostilities.

Conclusion

The International Court of Justice’s consideration of Nicaragua’s claims against Germany marks a watershed moment in the law of state responsibility for complicity in genocide. By linking the knowledge standard under the Genocide Convention with the risk-assessment framework of the Arms Trade Treaty, the case creates a new legal landscape for arms-exporting nations. Whether Germany’s exports to Israel ultimately violate either obligation remains to be seen, but the Court’s preliminary emphasis on prevention duties signals that arms transfers can no longer be treated as purely political decisions. The legal community will be watching closely as the case proceeds toward judgment on preliminary objections and, eventually, the merits.