The International Court of Justice has set November 22, 2027 for Israel's reply and May 22, 2029 for rejoinder in South Africa v. Israel, as a new doctrinal debate crystallises over when a military justification can defeat an inference of genocidal intent under the Genocide Convention.

The case concerns the application of the 1948 Genocide Convention in the Gaza Strip. At its core lies a question the court's case law has never squarely answered: when does a military explanation make the absence of genocidal intent a reasonable inference, so that genocidal intent is no longer the only reasonable one?

Writing in an analysis published October 12, Fadel Abdulghany — Executive Director of the Syrian Network for Human Rights and a doctoral researcher in International Criminal Law at the University of Glasgow — argues that the mere availability of a military objective is not enough. "A military explanation is reasonable only if it meets three criteria: probative fit, evidentiary support, and cumulative consistency," he writes.

What Does the Existing Case Law Require?

Two ICJ decisions frame the evidentiary problem. In Bosnia and Herzegovina v. Serbia and Montenegro, the court held that charges of exceptional gravity, such as genocide, must be proved by "fully conclusive" evidence, leaving the court "fully convinced" that the allegations have been "clearly established" (para. 209). In Croatia v. Serbia, the court held that where special intent (dolus specialis) is established by inference, genocidal intent must be the only reasonable inference — though reasonableness must not be construed so as to render proof by inference impossible (para. 148).

The first case sets the degree of persuasion. The second governs the reasoning that permits an inference from a pattern of conduct. Neither determines what an alternative military explanation must establish.

The United States, in its declaration of intervention filed March 12, 2026, concedes that a perpetrator may pursue a military objective while also intending to destroy the group (para. 20). That concession matters. If military purpose and genocidal intent can coexist, proof of a military purpose alone can never rule out genocide. Military purpose bears on intent only where it operates as evidence that the conduct can be explained by the pursuit of a military objective — supporting a competing, non-genocidal inference.

When Is a Military Explanation Reasonable?

The three proposed criteria draw on positions already advanced by intervening states:

• Probative fit — whether the alleged objective reliably explains the manner of the conduct: its geographic scope, scale, duration, and repetition. This develops Iceland's call for "a credible nexus" between the stated motive and the manner in which it was pursued (para. 29).
• Evidentiary support — whether the justification rests on evidence contemporaneous with the facts or is advanced principally in retrospect. Spain argues the inference test applies only between "alternative explanations that have been found to be reasonably supported by the evidence" (para. 25), so a merely asserted explanation never enters the comparison.
• Cumulative consistency — whether an explanation sufficient for individual incidents holds up against the pattern as a whole. Ireland asks whether the "cumulative effect" of the use of force "significantly exceeds what is either necessary or proportionate."

Applied to siege, starvation, and displacement, the criteria bite hardest. A justification based on denying an adversary materiel may explain restrictions tracking logistical supply lines. It does not explain restrictions on goods of no evident military value, or restrictions persisting across far wider territory after the alleged objective has been achieved.

What Are the Practical Consequences?

For practitioners, the framework redraws the battleground on intent. Evidence of compliance with the law of armed conflict, mitigation of civilian harm, or prisoner exchanges — the thrust of the US intervention (para. 21) — may rebut intent directly but does not show the conduct was explained by a military objective. Conversely, a justification that explains a single strike does not explain a pattern sustained against an entire population.

The analysis also addresses two objections. Critics who say the approach dilutes genocide's special intent overlook that the inference of genocidal intent needs affirmative evidence of its own — such as official statements or conduct no military objective explains. Critics who say proof becomes impossible once hostilities begin misread the framework: the military explanation is itself an inference drawn from the same record and must be tested with equal rigor. It cannot be presumed merely because it is available.

What Would the Court's Ruling Settle?

The court has not reached the merits. Israel's jurisdictional and admissibility objections remain pending. But if the declarations are admitted, Article 63(2) of the convention makes the court's interpretation binding on the intervening states. And although Article 59 confines the judgment's binding force to the parties, the court's reasoning may carry considerable weight in future disputes arising from siege and large-scale deprivation.

Ireland's intervention goes furthest, arguing that state responsibility does not require proof that state organs held specific intent "in the criminal sense," and proposing inference of intent from recklessness as to foreseeable consequences and assessment of breaches "on the balance of the evidence" (paras. 25–42). Those propositions would reshape the mental element and the Bosnia and Croatia proof standards — even though Ireland itself retains the language of specific intent.

One caution stands: failure to establish genocide does not settle the lawfulness of the conduct under international humanitarian law or international criminal law, whose elements and evidentiary frameworks differ. The convention answers one highly demanding question — not every question the conduct raises.