The ICC, based in The Hague, believes there are “reasonable grounds” to charge Mr. Duterte with murder as a crime against humanity, as an “indirect co-perpetrator” during the anti-drug campaign that rights groups estimate killed tens of thousands.

In his first foreign policy pronouncement, Ferdinand Marcos Jr on Thursday said he would uphold a 2016 decision by the Hague-based Permanent Court of Arbitration (PCA) that favoured Manila’s diplomatic protest against Beijing’s sweeping claims in the South China Sea.