The world's youngest nation has witnessed little peace over the last 14 years [AFP/Getty Images] Fears that South Sudan - the world's youngest nation - could plunge into a full-blown civil war have intensified as fighting continues in Jonglei state, north-east of the capital, Juba. Government forces are trying to retake territory from those loyal to First Vice-President Riek Machar, who has been suspended from his post after being accused of plotting to overthrow President Salva Kiir.