Experts say that a halt in oil production could escalate already acute levels of violence and insecurity in South Sudan.
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Griffiths has worked as the UN’s under-secretary-general for humanitarian affairs for three years.
The UN says a ‘humanitarian travesty’ is playing out in Sudan amid international inattention and inaction.
UN aid chief says 730,000 Sudanese children are thought to suffer from ‘severe’ malnutrition.