EGYPTIAN President Abdel Fattah al-Sisi has warned Ethiopia of the risk of conflict over its giant dam on the Blue Nile after talks involving the two countries and Sudan ended without progress. Ethiopia is pinning its hopes of economic development and power generation on the Grand Ethiopian Renaissance Dam, which Egypt fears will imperil its supply from the Nile. Sudan is also concerned about the impact on its own water flows. Delegations from the three governments met earlier this week in Kinshasa in the Democratic Republic of Congo but failed to bridge their differences. Sisi, speaking at the opening of…