UN secretary-general Antonio Guterres with former president of Liberia Ellen Johnson Sirleaf, president of the UN General Assembly Annalena Baerbock, Nobel Peace Prize laureate Maria Ressa, former prime minister of Norway Gro Harlem Brundtland and UN global advocate for peace Maryam Bukar Hassan during a high-level meeting to mark the 80th anniversary of the establishment of the UN at its headquarters in New York City on September 22 2025.