African Union investigators have released a report recounting a litany of horrors committed in the course of South Sudan's ongoing civil war, including routine gender-based violence and the indiscriminate killing of civilians.
The United States has circulated a draft resolution among UN Security Council members that would implement an arms embargo and other sanctions on South Sudan if President Salva Kiir does not sign the peace deal.
Since December 2013, the country has been engulfed in a civil war that has killed tens of thousands and turned more than 730,000 South Sudanese into refugees.
Witnesses implicated perpetrators belonging to the government Sudan People's Liberation Army and the allied South Sudan Liberation Army, who launched an offensive in Unity State in late April.
The recruitment of children younger than 15 years is a war crime according to the Geneva Conventions and the International Criminal Court.
The conflict in South Sudan is growing increasingly indiscriminate, as armed groups use radio broadcasts to encourage attacks on civilians.
Sudan has accused its neighbor of attacking its citizens in the disputed Abyei region, but South Sudan also faces a civil war.