Tensions in South Sudan are rising, threatening an already fragile peace deal between President Salva Kiir and his rival First Vice-President Riek Machar.

They signed the peace agreement in 2018 to end a five-year civil war that killed nearly 400,000 people. But now, many are worried that South Sudan could be on the brink of another civil war.

Ashley Lime, a BBC reporter in Nairobi, explains why this latest violence has escalated and outlines the relationship between these two leaders.

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