South Sudanese children released by armed groups attend a ceremony in the western town of Yambio, South Sudan on February 7, 2018. (Photo by Denis Dumo/Reuters)





In this photo taken Thursday, January 18, 2018, Nyakum Well, 27, who said she was separated from her two young children five days before when government troops attacked her town of Pieri, pours tea at her shop in the market in Akobo town, one of the last rebel-held strongholds in South Sudan. South Sudan's opposition is threatening to resort to “guerrilla warfare” if peace talks in Ethiopia fail in the coming days as government forces advance on remaining rebel strongholds in the fifth year of civil war. (Photo by Sam Mednick/AP Photo)





In this Sunday, June 18, 2017 file photo, displaced South Sudanese gather during a visit of UNCHR High Commissioner Filippo Grandi to a new site for displaced people outside of the U.N. protected camp, in Bentiu, South Sudan. Nearly four years after the United Nations threw open its doors to civilians fleeing South Sudan's civil war, more than 200,000 people still shelter in the often squalid camps but now the government is trying to entice them to go home, even as fighting rages on. (Photo by Sam Mednick/AP Photo)





In this Sunday, June 18, 2017 file photo, displaced South Sudanese look on during a visit of UNCHR High Commissioner Filippo Grandi to South Sudan's largest camp for the internally-displaced, in Bentiu, South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Friday, January 19, 2018, a woman carries containers of food and her baby on her chest in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Friday, January 19, 2018, a rebel fighter walks near their military base in Akobo, near the Ethiopian border, in South Sudan. United Nations peacekeepers are returning to the only U.N. base in South Sudan “clearly” in an area under opposition control as residents hope for protection from growing attacks by government troops. (Photo by Sam Mednick/AP Photo)





In this photo taken Thursday, January 18, 2018, a U.N. armored vehicle sits in an abandoned base in Akobo, near the Ethiopian border, in South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Friday, January 19, 2018, rebel fighters walk through town after receiving food in Akobo, near the Ethiopian border, in South Sudan. (Photo by Sam Mednick/AP Photo)





An 11-year-old former child soldier poses with his handmade rifle during a release ceremony in Yambio, South Sudan on February 7, 2018. (Photo by Stefanie Glinski/AFP Photo)





In this photo taken Thursday, January 18, 2018, children carry foodstuff on their heads as they walk in the market in Akobo town, one of the last rebel-held strongholds in South Sudan. Child abductions have risen during South Sudan's civil war as desperate people try to make a living, and one child, no matter the age, is said to sell for 20 cows, worth about $7,000. (Photo by Sam Mednick/AP Photo)





In this photo taken Tuesday, January 23, 2018, a family of recently displaced people arrive after walking for days, in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





A former child soldier stands next to rifles during the release ceremony for child soldiers in Yambio, South Sudan on February 7, 2018. (Photo by Stefanie Glinski/AFP Photo)





Newly released child soldiers wait in a line for their registration during the release ceremony in Yambio, South Sudan on February 7, 2018. (Photo by Stefanie Glinski/AFP Photo)





A young child soldier sits on the ground at a release ceremony, where he and others laid down their weapons and traded in their uniforms to return to “normal life”, in Yambio, South Sudan Wednesday, February 7, 2018. More than 300 child soldiers were released Wednesday by armed groups in South Sudan, the second-largest such release since civil war began five years ago. (Photo by Sam Mednick/AP Photo)





In this photo taken Sunday, January 21, 2018, an opposition fighter walks with his weapon on which is tied a red ribbon, signifying danger as a warning to government forces and a willingness to shed blood, according to an opposition spokesman, in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Thursday, January 18, 2018, recently displaced children sheltering in a rundown building look through the fence toward the market in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Monday, March 5, 2018, s*x worker Irene sits in her brothel in Juba, South Sudan. As World Women's Day is to be marked across the globe and women across much of the Western world have galvanized around the #MeToo movement, South Sudan remains a place where women face grinding difficulties and rights experts say most women remain voiceless. (Photo by AP Photo/Stringer)





In this photo taken Saturday, January 20, 2018, children play in empty cardboard boxes during a food distribution by Oxfam outside Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





South Sudanese children released by armed groups attend a ceremony in the western town of Yambio, South Sudan on February 7, 2018. (Photo by Denis Dumo/Reuters)





In this photo taken Sunday, January 21, 2018, a recently-displaced family walk into Akobo town, one of the last rebel-held strongholds in South Sudan, after fleeing recent fighting when government troops attacked their village. (Photo by Sam Mednick/AP Photo)





In this photo taken Monday, January 22, 2018, a boy walks through a market carrying his chicken in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Thursday, January 18, 2018, children fish from a dugout canoe in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Saturday, February 17, 2018, the winner of Miss World South Sudan 2017, Arual Longar, spends time at a shelter for street children in Juba, South Sudan. Amid the killing of untold tens of thousands of people, famine and mass displacement in five years of civil war, a small number of young women are using international beauty pageants to advocate for peace, both at home and abroad. (Photo by Sam Mednick/AP Photo)





In this Sunday, May 14, 2017 file photo, a displaced family stands behind the razor-wire that surrounds the United Nations' protected camp in Wau, South Sudan. (Photo by Sam Mednick/AP Photo)





In this photo taken Wednesday, January 24, 2018, men return from the bush after hunting gazelle to sell at the market in Akobo town, one of the last rebel-held strongholds in South Sudan. (Photo by Sam Mednick/AP Photo)