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The White House has said it will press for sanctions against Boko Haram, the Nigerian Islamist group which kidnapped hundreds of schoolgirls. But what would such a measure achieve? Elizabeth Donnelly, is assistant head of the Africa programme at the think tank, Chatham House. (Photo: A screen grab showing the suspected leader of Boko Haram, Abubakar Shekau. Credit: AFP/Getty Images)