Sang Hyun-song, president of the International Criminal Court, said in his annual report that nearly a dozen countries have embraced treaties related to the crime of aggression and the use of chemical weapons since last year's report.
"Regrettably, arrest warrants remain pending against four persons suspected of having committed very grave crimes in the Darfur situation," the president said. "The active support of the U.N. Security Council will be essential in ensuring that these persons are brought before the court."
Sudanese President Omar al-Bashir is among those wanted for atrocities allegedly committed in Darfur. Former Ivorian President Laurent Gbagbo and sitting Kenyan President Uhuru Kenyatta are among those facing the ICC for alleged war crimes.
Sang said more support for the ICC was needed because ad hoc state tribunals were closing their doors.
"The ICC's role in the global efforts for peace, security and the prevention of mass atrocities will be even more pronounced than it is today," he said in his Thursday address to the U.N. General Assembly.
Ivory Coast delivered the instrument of ratification to U.N. headquarters in February, making it the latest and 122nd party to the Rome Statute creating the court.