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South Sudan's President Salva Kiir (L) and his Sudanese counterpart Omar al-Bashir attend a press conference at Khartoum's airport on November 4, 2014. Salva Kiir starts an official visit to talk with Sudanese officials about the disputed border between the two countries and the deteriorating security situation in the south. AFP PHOTO /ASHRAF SHAZLY (Photo credit should read ASHRAF SHAZLY/AFP/Getty Images)

South Sudan's President Salva Kiir (L) and his Sudanese counterpart Omar al-Bashir attend a press conference at Khartoum's airport on November 4, 2014. Salva Kiir starts an official visit to talk with Sudanese officials about the disputed border between the two countries and the deteriorating security situation in the south. AFP PHOTO /ASHRAF SHAZLY        (Photo credit should read ASHRAF SHAZLY/AFP/Getty Images)