It has been 18 months since more than 200 schoolgirls were kidnapped by Boko Haram from the remote town of Chibok in Borno state. President Muhammadu Buhari has pledged to defeat the armed group by December and is willing to negotiate to secure the girls’ release.

In this Headliner preview, Buhari tells Hasan, "[Boko Haram has] to prove to us that they are alive, they are well, and then we can…negotiate with them."

"We said it and we meant it. If we are satisfied that the girls are alive," the president adds.

On what the Nigerian government is willing to offer the armed group, Buhari says "it will depend on the leadership of Boko Haram".

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Source: Al Jazeera