Ethiopia's prime minister said South Sudan's President Salva Kiir and rebel leader Riek Machar missed a deadline to reach a peace agreement by midnight yesterday, and that further talks on Friday "did not produce the necessary breakthrough."
"This is unacceptable, both morally and politically," Hailemariam Desalegn said in the statement issued by the east African regional bloc IGAD, which has been trying to mediate a peace deal.
"Continuing a war flagrantly disregards the interests of you, the people," he said, addressing the people of South Sudan, whose country only gained independence from Khartoum in 2011 after a long, bitter war.
"It is an abdication of the most sacred duty leaders have to you, their people: to deliver peace, prosperity and stability," the Ethiopian premier said of Kiir and Machar, both of who have been implicated in atrocities.
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South Sudan's civil war started in December 2013 when Kiir accused Machar, who had been sacked as vice president, of attempting a coup.
Over two dozen armed groups -- including government soldiers and allied militia backed by Ugandan soldiers on one side, and a range of rebel factions on the other -- have been battling it out since.
Tens of thousands of people have died in the conflict, two million have been uprooted and 2.5 million are in desperate need of food aid.
Possible targets include leaders or officials who obstruct peace talks, impede humanitarian aid deliveries, recruit child soldiers or attack UN peacekeepers.
Acknowledging IGAD's failure to broker peace, Hailemariam said the "peace process must be reinvigorated and reformed".