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The US Treasury Secretary, Janet Yellen, is visiting South Africa on the latest stage of a three-nation African tour aimed at boosting US influence.
The tour – which also included Senegal and Zambia – comes as Washington faces growing competition in the region with Russia and China.
South Africa has recently taken over the chair of the Brics economic group – made up of Brazil, Russia, India, China and South Africa – which was set up as a counterweight to US global dominance.
While in South Africa, Ms Yellen is expected to push President Cyril Ramaphosa to pursue plans for a gradual transition away from a heavy reliance on coal to cleaner energy.