Ethiopia’s Tigray Victory Risks Igniting Interstate War with Eritrea

Key points

• Ethiopian government forces recaptured Mekelle on October 3 and resumed flights to the city by October 12, signaling military momentum against the Tigray People’s Liberation Front (TPLF).
• Ethiopia’s Foreign Minister Gedion Timothewos cited Article 51 of the UN Charter, claiming Eritrean troops advanced 38 miles into Tigray, while Eritrea’s Foreign Minister Osman Saleh called this a 'declaration of war.'
• The UN Security Council scheduled a closed-door session on October 13 to address the crisis, with Ethiopia accusing Eritrea of financing and directing the rebel alliance, including the Fano and Oromo Liberation Army.
• Eritrea has cultivated alliances with Egypt and Sudan, who met on October 4 to coordinate military and intelligence efforts, framing Red Sea governance as a matter for coastal states to exclude landlocked Ethiopia.
• The African Union and former Nigerian President Olusegun Obasanjo have failed to mediate a peace deal, while the US lifted sanctions on Eritrea and signed a $5 billion aircraft deal with Ethiopia, complicating diplomatic efforts.

Background

The current crisis stems from the unresolved 2022 Pretoria agreement, which ended the first Tigray war but left disarmament and territorial disputes unresolved. Eritrea, which fought alongside Ethiopia in 2020-2022, now views the TPLF as a buffer against Addis Ababa’s ambitions for Red Sea access. Ethiopia’s loss of a coastline in 1993 has fueled long-standing tensions, with Prime Minister Abiy Ahmed previously stating that the loss of the port of Assab was a mistake to be corrected.

How outlets are covering it

Responsible Statecraft emphasizes Ethiopia’s military momentum as a potential driver for escalation, noting that Addis Ababa may view a northern campaign as a way to resolve its security dilemma and Red Sea access issues simultaneously. International Crisis Group highlights the risk of a wider regional conflagration, warning that Sudan and Egypt are primed to support Eritrea, while the UAE may back Ethiopia. Geopolitical Futures, though behind a paywall, suggests the conflict could fundamentally reshape the Horn of Africa’s stability. All sources agree that the TPLF’s command remains intact despite its retreat from Mekelle, and that the Fano and Oromo Liberation Army continue to pose significant threats to the federal government.

Why it matters

A full-scale war between Ethiopia and Eritrea could disrupt the Red Sea, a critical global trade route, and trigger a broader regional conflict involving Egypt, Sudan, and the UAE. The crisis also threatens to unravel the 2022 peace agreement, potentially leading to further displacement and instability in the Horn of Africa. The international community’s failure to mediate effectively risks allowing the conflict to escalate into a protracted interstate war.

What to watch

The UN Security Council’s October 13 session will be critical in determining whether diplomatic efforts can prevent a full-scale war. Ethiopia’s military advance toward the Eritrean border and Eritrea’s potential withdrawal of troops from Tigray will be key indicators of escalation. The African Union and former leaders like Olusegun Obasanjo may be tasked with restarting peace talks, while the US and European powers may attempt behind-the-scenes mediation. The outcome of the Tigray conflict and the status of the rebel alliance will also influence the broader regional dynamics.