British Prime Minister Theresa May, left, is welcomed by Nigeria's President Muhammadu Buhari, at the Presidential palace in Abuja, Nigeria, Wednesday, Aug 29, 2018. Britain and Nigeria have signed a security and defense agreement during a one-day visit by Prime Minister Theresa May as Africa's most populous country struggles to defeat Boko Haram extremists and others linked to the Islamic State organization. (AP Photo/Azeez Akunleyan)
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