Confronted by the growing threat of Middle East militants, President Barack Obama implored world leaders at the United Nations Wednesday to rally behind his expanding military campaign to stamp out the violent Islamic State group and its “network of death.”

“There can be no reasoning, no negotiation, with this brand of evil,” Obama told the General Assembly. In a striking shift for a president who has been reluctant to take military action in the past, Obama declared that force is the only language the militants understand. He warned those who have joined their cause to “leave the battlefield while they can.”

The widening war against the Islamic State was just one in a cascade of crises that confronted the presidents, prime ministers and monarchs at the annual meeting of the U.N. General Assembly. Also vying for attention was Russia’s continued provocations in Ukraine, a deadly Ebola outbreak in West Africa, and the plight of civilians caught in conflicts around the world.

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