The police in the Philippines arrested Rodrigo Duterte, the country’s former president, on Tuesday on charges of crimes against humanity under a warrant by the International Criminal Court.

       While in office, Mr. Duterte encouraged the police to hunt down and kill people whom they suspected of being involved in the illegal drug trade. Human rights groups say that more than 30,000 people were killed in extrajudicial executions.

       The arrest represents a significant victory for the I.C.C., an independent judicial body that investigates and tries people accused of genocide, war crimes, crimes against humanity and the crime of aggression from its base in The Hague.

       But Mr. Duterte’s arrest also shows the limits of the court’s power: Although its jurisdiction is sweeping, the court cannot carry out arrests on its own. It relies on the cooperation of national governments to execute its warrants, which leaves it at the mercy of domestic politics.

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       Arresting Mr. Duterte was possible because he was out of office and politically weakened. By contrast, there appears to be essentially no chance that the I.C.C. arrest warrants for President Vladimir V. Putin of Russia or Prime Minister Benjamin Netanyahu of Israel will be carried out anytime soon.

       On paper, the I.C.C. has the ability to order the arrest of anyone who is alleged to have committed a crime listed in the Rome Statute, the 1998 treaty that established the court, and who is either a national of an I.C.C. member state or committed the crime on the territory of one. Even sitting leaders are not immune from prosecution — a notable departure from the usual rules of international law. (Mr. Duterte withdrew the Philippines from the court during his presidency, but a panel of I.C.C. judges found that the court still has jurisdiction because his alleged crimes took place before that withdrawal.)

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