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Nigerian President Goodluck Jonathan (R) and Chinese Prime Minister Li Keqiang hold a joint press briefing at the presidential villa in Abuja on May 7, 2014. Li vowed to boost trade and investment with Nigeria, Africa's biggest economy and leading oil producer, as he met embattled President Goodluck Jonathan for talks. AFP PHOTO/PIUS UTOMI EKPEI (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)

Nigerian President Goodluck Jonathan (R) and Chinese Prime Minister Li Keqiang hold a joint press briefing at the presidential villa in Abuja on May 7, 2014. Li vowed to boost trade and investment with Nigeria, Africa's biggest economy and leading oil producer, as he met embattled President Goodluck Jonathan for talks. AFP PHOTO/PIUS UTOMI EKPEI        (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)