Fifteen years have passed since the Security Council adopted resolution 1261 (1999), its first thematic resolution on the plight of children in armed conflict. By means of that resolution, the international community sent a clear signal: the suffering of children in armed conflict is unacceptable, whether they be child soldiers, sex slaves, victims in schools and hospitals or affected in any way. Such attacks violate the most basic human rights. They also threaten the achievement of lasting peace and development.