A young Yazidi woman held captive and raped by Islamic State militants appealed to world leaders at the United Nations on Monday to end war and improve the lives of millions of refugees as they agreed a voluntary framework to respond to the global crisis.

Nadia Murad Basee Taha, 23, recently appointed a goodwill ambassador for the U.N. Office on Drugs and Crime, told leaders at a U.N. refugee and migrants summit ahead of the 71st General Assembly: "You decide whether it is to be war or peace.

"We have to address the causes of immigration, not just the immigration itself. ... We have to end wars and put humanity first," said Taha, who was held by Islamic State in Iraq for several months in 2014. "I wished that the rapes I endured by 12 terrorists were 12 bullets in my flesh."