A fragile power-sharing agreement in the world's youngest nation is being threatened by an upsurge in violence. South Sudan's President - Salva Kiir - says the army is being attacked by armed groups linked to his vice President Riek Machar. The two were on opposing sides of a five-year civil war, before agreeing to rule together in 2018. With a war ongoing in neighbouring Sudan, what would a new conflict in South Sudan mean for the region?
