In this photo taken Friday, July 26, 2013, former South Sudan Vice President Riek Machar speaks to the media announcing he will run for the presidency in 2015 against President Salva Ki

 

              In this photo taken Friday, July 26, 2013, former South Sudan Vice President Riek Machar speaks to the media announcing he will run for the presidency in 2015 against President Salva Ki
In this photo taken Friday, July 26, 2013, former South Sudan Vice President Riek Machar speaks to the media announcing he will run for the presidency in 2015 against President Salva Kiir, who sacked Machar and his cabinet earlier this week, in Juba, South Sudan. Tuesday's government shake-up, including the dismissal of the cabinet, followed reports of a power struggle within the ruling party especially between Kiir and Machar. (AP Photo/Mackenzie Knowles-Coursin)