Conflict over oil in South Sudan is prolonging a war predicted to spiral into famine if fighting does not end and risks dragging in regional nations, analysts warn. Despite heavy international pressure, a second cease-fire this month for the world’s youngest nation has crumbled, in a war that has already claimed thousands — possibly tens of thousands — of lives. With the war entering its sixth month, oil fields that once generated hundreds of millions of dollars providing 98 percent of government revenue are “key strategic objectives,” the International Crisis Group (ICG) said...” Less than three years old, grossly underdeveloped South Sudan was the most oil-dependent nation in the world at independence. “Oil is a significant driver of the conflict,” said Emma Vickers of Global Witness...Rebel chief Riek Machar “has made his plans very clear to attack and take oil fields as a way to hold the government hostage,” Vickers added, with fighting now concentrated in the main remaining oil producing fields in Upper Nile.