“When Washington imposed sanctions in June 2012 on Boko Haram leader Abubakar Shekau, he dismissed it as an empty gesture. Two years later, Shekau’s skepticism appears well founded: his Islamic militant group is now the biggest security threat to Africa’s top oil producer, is richer than ever, more violent and its abductions of women and children continue with impunity. “
Source: How Boko Haram is beating U.S. efforts to choke its financing | Reuters