Top U.S., Chinese and Russian officials tour Africa as global charm offensive gathers pace

Elliot SmithCNBC KEY POINTS Yellen met with South African officials including President Cyril Ramaphosa last week, just days after the country’s Foreign Minister Naledi Pandor stood alongside Lavrov and vowed to strengthen bilateral relations between Pretoria and Moscow. In the backdrop of Yellen’s trip is Washington’s concern about its waning influence on a continent that…