Egypt’s president on Monday hosted his Djiboutian counterpart for talks on improving ties and a controversial dam that Ethiopia is building on the Nile River’s main tributary, which Egypt deems an existential threat. Djibouti President Ismail Omar Guelleh landed in the Egyptian capital of Cairo on Sunday. He was received at the airport by President Abdel Fattah al-Sisi. Guelleh’s visit comes more than eight months after al-Sssi paid a rare visit to the strategic Horn of African nation. Al-Sisi was the first Egyptian leader to visit Djibouti since it declared independence in 1977. It was part o…