It is close to decision time for Egypt’s President Abdel Fattah El Sisi.
His army has spent weeks on exercise, preparing for the possibility of crossing the border into Libya in defence of its national security and of the port town of Sirte.
Libya’s Government of National Accord has pushed the rival government's Libya National Army forces further east.
Now, the GNA has moved fighters closer to Sirte, a gateway to Libya’s main oil terminals and ports, which it says it plans to recapture from the eastern-based LNA.
Mr El Sisi has said he will intervene if the GNA moves to take the city. But with Turkey and Qatar supporting the GNA, how far will Egypt go to back the LNA?
Tim Marshall investigates in this week’s episode of Sightline.
