The International Criminal Court has found detained former Philippine president Rodrigo Duterte fit to stand trial, judges of the ICC ruled this week in a decision issued ahead of the opening of proceedings next month.

The pre-trial chamber's ruling removes the principal preliminary obstacle to substantive hearings in one of the most closely watched international criminal cases of the past decade. The court announced the decision in a brief public communication, framing it as the last major pre-trial determination before the case opens at the ICC's headquarters in The Hague.

"Judges of the International Criminal Court found detained former president Rodrigo Duterte to be fit to stand trial," the court said, noting that the ruling came "ahead of the opening of the trial next month."

What did the court decide?

A pre-trial chamber of the International Criminal Court concluded that Duterte is mentally and physically capable of participating in his own defence. Under the court's procedural framework, judges must be satisfied that an accused understands the nature of the proceedings and can meaningfully instruct counsel before allowing the case to proceed.

The fitness finding forecloses one of the narrow grounds on which an ICC case can be paused short of an acquittal or conviction. Had the chamber reached the opposite conclusion, judges would have been obliged to consider whether proceedings should be stayed, suspended, or modified to protect Duterte's right to be present at trial.

What does the ruling change for practitioners?

For international criminal practitioners, the practical consequence is procedural rather than substantive. The case will now move into its evidentiary phase on the scheduled timeline, without the protective measures an unfitness ruling would have required.

Defence counsel had raised health-related concerns in earlier filings. The chamber's ruling indicates judges found those submissions insufficient to warrant a finding of unfitness. Defence teams are expected to continue litigating the jurisdictional and admissibility objections they have pursued throughout the pre-trial phase, while prosecutors prepare to meet the standard of proof applicable at trial.

When does the trial open?

The trial is scheduled to begin next month at the ICC's headquarters in The Hague. Responsibility for the case will transfer from the pre-trial chamber to a trial chamber, which will set a timetable for disclosure, the presentation of evidence, and any testimony from the accused.

Fitness rulings are not separately appealable on their merits, though related procedural issues can be raised during the trial itself. Practitioners following the case will look to the trial chamber's first orders, the disclosure schedule, and any rulings on Duterte's continued detention as the next indicators of how the proceedings will unfold.

What is the broader context?

Duterte served as president of the Philippines from 2016 to 2022. He was transferred to ICC custody following his arrest on an ICC-issued warrant and has remained in detention at the court's detention centre in The Hague.

The Philippines is not a state party to the Rome Statute, the ICC's founding treaty. Manila formally withdrew from the court in 2019, although the ICC has asserted jurisdiction over events occurring on Philippine territory during the period before that withdrawal. The prosecution alleges criminal responsibility for killings carried out during Duterte's signature anti-drug campaign, which rights groups have long documented.

Duterte has denied responsibility for unlawful killings and has characterised the ICC proceedings as politically motivated. His legal team has signalled it will continue to challenge the court's jurisdiction and the lawfulness of his arrest throughout the trial phase.

For practitioners in The Hague and beyond, the fitness ruling closes one stage and opens another. The coming weeks will set the procedural architecture within which the substantive allegations against Duterte will be tested.