African trade flows may shift further away from the US after President Donald Trump announced a slew of new tariffs, the head of Citigroup Inc.’s regional office said.Trump unveiled a revised global plan on Thursday that imposed levies as high as 30% on imports from countries including South Africa — the continent’s biggest economy — and Algeria.

China’s top leaders have pledged to help companies slammed by higher U.S. tariffs but held back on major moves after trade talks.

South African products exported to the US will be hit by a 30% tariff from 7 August, President Donald Trump has announced. South Africa faces the highest rate in sub-Saharan Africa, reflecting Trump's strained relationship with the government of President Cyril Ramaphosa.

It follows similar drops in markets in Europe and Asia after the US president said he was moving forward with tariff plans.

U.S. President Donald Trump's latest wave of tariffs on exports from dozens of trading partners, including Canada, Brazil, India and Taiwan, sent global markets tumbling on Friday as countries pushed for talks to clinch better deals.

The White House cited national security concerns for its tariff on copper, and Trump asked for restrictions on the export of copper scrap.