South Sudan's government has denied claims made by Sudan's President Omar al-Bashir that Egypt has provided military aid to Juba.
Egypt and South Sudan officially denied that Egyptian warplanes have bombed the rebel-held state of Upper Nile, after SPLA-IO rebels accused Cairo of dropping nine bombs on their positions.
Comment: The honeymoon is over for the Egyptian president, and his support may ebb away in the wake of the islands debacle, writes Robert Springborg.
Saudis have called for international arbitration and even the expulsion of Egyptians after a court voided an agreement to hand over two Red Sea islands to the kingdom.
As Egypt continues to court Nile Basin countries, President Sisi met with South Sudan's leader in Cairo amid ongoing fears about the future of a controversial Ethiopian dam project.
The long read: Two years after acceding to the throne, King Salman faces mounting challenges; both regional and domestic, and questions around his succession remain unanswered, writes Alain Gresh.
Egyptian media have lashed out at Saudi Arabia after Riyadh officials visited a controversial dam in Ethiopia, dealing a fresh blow to already strained tensions.
Sisi met with his Eritrean counterpart in Cairo on Tuesday in a meeting that sources have said was a "deliberate move" against Ethiopia.
Ethiopia says 'enemies' from Egypt and Eritrea are supporting unprecedented anti-government protests and forcing the declaration of the country's first state of emergency in a quarter-century.
Comment: The Egyptian foreign minister's trip to see Binyamin Netanyahu reveals a Sadat-like foreign policy agenda - shunting the Palestinian issue down the priority list, writes Mohamed ElMeshad.