Malaysian prime minister Najib Razak said the muslim world had to win the ideological war against the Islamic State group.
"They call our youth with the siren song of illegitimate jihad, and they demand all muslims swear allegiance to their so-called caliph."
He called for lessons to be heeded from past interventions.
"We have launched wars without planning for peace, we have attacked one evil only to see a greater evil emerge. This time must be different," he said.
Also at the UN, Pakistani prime minister Nawaz Sharif said: "The emergence of new militant entities in the Middle East once again illustrates that terrorism is a global threat."
In Europe, Muslim groups have held a demonstration outside Paris' main mosque to denounce the "barbarism" of Islamic State militants, as flags fly at half mast after the beheading of a French national.
The demonstration comes as France is engaged in air strikes in Iraq. The government also promised more support for Syrian opposition forces, as the country mourns the murder of hostage Herve Gourdel by jihadists.
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