(FILES) Nigeria's President Muhammadu Buhari (L) and South Africa's President Cyril Ramaphosa walk past the guard of honour during his official state visit at Union Buildings in Pretoria, on October 3, 2019. Longstanding tensions have taken an ugly turn recently, spilling over into sports, music, ride-sharing apps and even beauty contests. (Photo by Phill Magakoe / AFP) (Photo by PHILL MAGAKOE/AFP via Getty Images)