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President Barack Obama warned South Sudan on Saturday that Washington and its allies would cut aid to the country over any attempted military coup, amid growing fears of civil war. And top US diplomat John Kerry called South Sudanese President Salva Kiir to stress that the renewed violence endangers the independence of the young nation born in July 2011 with backing from the United States, breaking away from Sudan after a five-decade struggle. Obama also urged South Sudan's leaders to help protect US personnel and citizens in the conflict-ravaged country, after American military aircraft were hit, wounding four servicemembers. "He underscored that South Sudan's leaders have a responsibility to support our efforts to secure American personnel and citizens in Juba and Bor," a White House statement said.