"I think it's absolutely vital for every country, every leader, to send a signal that the viciousness of a handful of killers does not stop the world from doing vital business," he said following an Asia-Pacific summit in
In addition to hunting down terrorists, missile strikes, curbing jihadist financing and other steps, "the most powerful tool we have to fight ISIL is to say that we're not afraid", he said, using one of the acronyms for the Islamic
Over the past week Obama and other Asia-Pacific leaders have held successive summits in Turkey, the Philippines and Malaysia that have been overshadowed by the recent string of deadly extremist attacks.
The carnage in Paris, Lebanon and Mali has sparked calls by assembled leaders for a concerted international effort to stamp out Islamic State and other jihad groups.
Obama is among world leaders due in Paris for talks beginning November 30 and intended to reach a global climate change accord.
"We do not succumb to fear. That's the primary power that these terrorists have over us," he said.