Breakthrough comes after years of unsuccessful talks regarding the Grand Ethiopian Renaissance Dam, which became so heated at times that some feared military conflict

In latest sign of leaders' closeness, Sissi calls US president 'a man with unique power to confront crises'

Addis Ababa rejects Cairo's offers, moves on with construction of massive dam that could limit water supply; pro-Sissi pundits call for invasion similar to 1973 war with Israel