South Sudan has hiked work permit fees 100-fold for foreign aid workers to 10,000 dollars. A decree from the labour ministry indicates that Juba will now charge 10,000 dollars for foreigners working in a professional capacity, 2,000 dollars for blue collar employees and 1,000 dollars for casual workers from March 1. The world's youngest nation has been mired in civil war since 2013, when President Salva Kiir fired his deputy Riek Machar. This sparked a conflict that has increasingly split the country along ethnic lines. Last month, the United Nations declared that parts of the country are experiencing famine. Nearly half the population, or about 5.5 million people, is expected to lack a reliable source of food by July.