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The 2016 Olympic Games were formally opened in a joyful, musical ceremony at Rio's Maracana stadium.
The country's track-and-field athletes and weightlifters have been barred over doping offences.
There are fears that a guilty verdict could worsen Brazil's poltical turmoil.
The South African Trade Minister said Pretoria expects to replicate its successful EU trade deal with the UK.
The new measure would replace 11 state and central levies into a national sales tax, reducing business transaction costs and creating a single market.
Africa's most industrialized country is struggling with diverse challenges, including promises to create jobs and address poverty.
Brazilian officials are working closely with allies to boost their anti-terrorism preparedness ahead of the Games.
Ukraine operates several transit pipelines and energy official have said the country could be forced to stop using some of them if Russian transit flows decline.
A police statement said 65 people suspected of committing acts of violence and vandalism had been arrested since Friday.
Uber has lost more than $2 billion in China in a costly battle with Didi for market share in the country.
