Around four in 10 countries where conflicts have ended return to a state of war within a decade, which is why investing in disarmament, demobilization and reintegration is crucial to sustaining peace. That was one of the key messages from the UN Department of Peace Operations (DPO) and UN Development Programme (UNDP) at this year’s Symposium on Disarmament, Demobilization and Reintegration which was held in Geneva. To find out more, UN News’ Nathalie Minard spoke to Thomas Kontogeorgos, an expert on the issue based at DPO.  She asked him about the situation in Haiti, DRC, Mali and Sudan – and what support the UN still provides to countries once peacekeeping missions come to an end.