ISTANBUL  More than 450,000 children in South Sudan’s Jonglei state are at imminent risk of acute malnutrition as escalating violence has caused widespread displacement and disrupted essential health services, UNICEF warned on Tuesday. “We know that a malnourished child without treatment is 12 times more likely to die,” UNICEF country representative Noala Skinner said in a statement. Violent clashes have displaced at least 250,000 people, primarily in the northern and central regions of the