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.

Instagram: @bbcwhatintheworldEmail: whatintheworld@bbc.co.ukWhatsApp: +44 0330 12 33 22 6Presenter: Hannah GelbartProducers: Emily Horler and Benita BardenEditor: Verity Wilde