![South Sudan's then-rebel leader Riek Machar (R) and South Sudan's President Salva Kiir exchange signed peace agreement documents in Addis Ababa in this May 9, 2014 file photo.](/sites/default/files/multimedia_images_2016/2016-06-south_sudan-africa-kiir-machar.jpg)
South Sudan's then-rebel leader Riek Machar (R) and South Sudan's President Salva Kiir exchange signed peace agreement documents in Addis Ababa in this May 9, 2014 file photo.
© 2014 Reuters
South Sudan's then-rebel leader Riek Machar (R) and South Sudan's President Salva Kiir exchange signed peace agreement documents in Addis Ababa in this May 9, 2014 file photo.