evidence: An army officer, speaking on condition of anonymity, told AFP that Equatorial Guinean soldiers had crossed the Ntem river that forms a natural border between the two countries, and erected milestones in the town of Kye-Ossi on the Cameroonian side. [...] Equatorial Guinea is an oil-rich Central African nation which has been led by President Teodoro Obiang Nguema since 1979. Rights groups and corruption reports have ranked the country low in both areas.