The Oscar winner looked perfectly poised during her video appearance, sporting simple makeup, a chic black blazer and black blouse.
"Successful prosecution and new legal benchmark, whether at the ICC or elsewhere, is a part of the long and vital generational effort," she said in the clip. "That is the light in which I believe the court's new policy on children should be seen."
The ICC also tweeted about Jolie's video appearance. "#AngelinaJolie welcomes #OTP policy: Mankind owes to #children," the organization wrote. "We know we aren't giving the best to children. #ICCProsecutor4Children #ICC."
In a statement to ET last Wednesday, Jolie's rep said the actress was "relieved" that the investigation had concluded, and that her focus has always been on the health of the family.
"Angelina said from the beginning that she felt she had to take action for the health of the family and is relieved that after their eight-week involvement, the DCFS is now satisfied the safeguards are put in place that will allow the children to heal," the statement read.
"It wasn't clearly founded that there was any abuse by Pitt," a source explained to ET, emphasizing that there was no validation or proof of abuse, while another source said that the actor's visits with his children -- 15-year-old Maddox, 12-year-old Pax, 11-year-old Zahara, 10-year-old Shiloh, and 8-year-old twins Knox and Vivienne -- are still monitored with a therapist.
Pitt, too, seemed to be in high spirits after DCFS' investigation had concluded, as he made his first red carpet appearance since the split at the Los Angeles premiere of his new film, Allied, last Wednesday night.