The International Criminal Court has ruled that former Philippine president Rodrigo Duterte is fit to stand trial, clearing the way for proceedings against him at The Hague to continue as planned.

The ICC's finding resolves a preliminary question that had hung over the case since Duterte's transfer to the court's custody. Judges determined the 80-year-old former president is mentally and physically capable of participating meaningfully in his own defence.

What does the ruling change?

With fitness confirmed, the case moves forward toward trial on charges relating to the deadly "war on drugs" that defined Duterte's presidency. A finding of unfitness would have paused proceedings indefinitely or led to their suspension; instead, the court's pre-trial and trial track can now proceed.

For practitioners, the decision narrows the defence's available avenues. Capacity challenges before international tribunals typically require robust medical evidence demonstrating an inability to instruct counsel or follow proceedings. The judges' assessment signals that any such evidence fell short of the threshold the ICC applies.

The ruling also carries procedural weight: under the Rome Statute framework, fitness determinations can be revisited if a party introduces new evidence of deterioration. Defence teams may renew the question at a later stage, but for now the burden shifts to preparing for substantive hearings.

Why does the case matter?

Duterte is the most senior Philippine political figure to face international prosecution. The ICC's jurisdiction over the conduct at issue has been contested, since the Philippines withdrew from the Rome Statute during his presidency. The court has maintained that it retains jurisdiction over alleged crimes committed while the country was still a member.

The fitness ruling keeps that contested jurisdictional framework on a collision course with a full trial, one that will test the ICC's ability to prosecute a former head of state from a non-member state.

Duterte's legal team has not indicated whether it will seek leave to appeal the fitness determination.