"Of course we must contain them militarily, that's absolutely important because they are a military force. But I think more important, and going forward, is ideological. We have to deal with the ideological issues and (Nigeria's) President Buhari has simply called on Muslim leaders all over the world to speak out against the Islamic State and fundamentally attack that evil ideology," Yemi Osinbajo told CNBC on Friday from the World Economic Forum in Davos, Switzerland.
Nigeria's population is split fairly evenly between Christians and Muslims, although the Islamic populace is seen becoming proportionately larger over time.
The country faces a major struggle against Islamist terrorists, with the Boko Haram group claiming allegiance to ISIS and operating mainly in Nigeria. In the first nine months of 2015, Boko Haram killed 3,500 civilians across Nigeria, Cameroon, Chad and Niger, according to Amnesty International.