Eritrea

So what?  An Article 51 filing lays legal groundwork for cross-border action, which makes Assab the likeliest objective if Ethiopia escalates. A fight there would open a second armed front on the Red Sea approaches beside the Houthi-Saudi war, and Djibouti, which carries most of Ethiopia's trade, would absorb the shipping and refugee spillover.

So what?  A TPLF that has withdrawn rather than been beaten points to an insurgent phase, not a quick settlement. Outflow of Tigrayans across the border, and a second front with Eritrea, are the lagging indicators to watch.

So what?  Since Statim flagged the explosions in Addis Ababa, a security incident has become a formal rupture that closes the channel most likely to restrain a state-to-state war. Expect Eritrean and Tigrayan outflows toward Sudan and Kenya if fighting widens, with Red Sea port access the likeliest flashpoint, unless an African Union or Gulf mediator gets both sides into a room.

So what?  Adding Egypt ties the northern fighting to the Nile-dam and Sudan-war rivalries, so expect displacement to keep pushing toward the Djibouti and Eritrea frontiers rather than settle. Escalation in Afar would harden that read, while a public Ethiopia–Eritrea channel would soften it.

So what?  An Eritrea that stays neutral or hedges, rather than repeating its 2020-22 role fighting alongside federal forces, would remove a force that helped Addis Ababa hold the line last time and tilt the war’s trajectory further against Abiy’s government. Watch for any Eritrean troop movement toward the Tigray border as the clearest signal of which way Asmara leans.