What you need to know:
- Last month he and President Salva Kiir signed a new peace deal in the latest attempt to end the five-year war.
South Sudan rebel leader Riek Machar returned to the capital Juba on Wednesday, according to a Reuters witness, more than two years after he fled the country after the collapse of a 2016 peace deal.
Machar, the former vice president, fled to neighbouring Democratic Republic of Congo in 2016 after fierce fighting broke out in Juba, killing hundreds of people.
He later travelled to South Africa, where he was held under house arrest until earlier this year.
Last month, Mr Machar and President Salva Kiir signed a new peace deal in the latest attempt to end the five-year war.