Civil war has raged across Sudan for almost two years now, spreading millions of refugees around east Africa including into its neighbour South Sudan. While the war slips behind the headlines for many in Europe,

The top U.N. official in South Sudan is warning that the country is teetering on the edge of renewed civil war.

"Because of the war in Sudan, South Sudan's main oil export pipeline burst one year again and South Sudan is a petro-state that relies almost entirely on oil revenues, so for the past year South Sudan has been in a very deep fiscal crisis," he said. "So, we've seen a lot of cracks in the politics and security alliances."