South Sudan's top UN aid official has hailed a new peace deal and called for food aid to flow to counter the risk of mass hunger. A military spokesman said a cease-fire would take hold, but wary skepticism remained: This is the conflict's second peace deal. The truce signed by President Salva Kiir and former Vice President Riek Machar late on Friday in neighboring Ethiopia calls for a cessation of hostilities within 24 hours and unhindered humanitarian access. Though it is the second peace deal of the nearly five-month conflict, the two leaders did not attend talks that forged the first cease-fire in January. This time they stood face to face, a hopeful sign one week after US Secretary of...