The Ethiopia Eritrea conflict moved closer to open interstate war on Friday, Oct. 9, 2026, when Ethiopia told the U.N. Security Council it is taking measures in self-defense against its northern neighbor. Addis Ababa accused Eritrea of sending troops across the border and occupying parts of northern Ethiopia as federal and allied forces push deeper into the Tigray region.
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In a letter dated Friday, Foreign Minister Gedion Timothewos invoked Article 51 of the U.N. Charter, which recognizes a state’s right to defend itself against armed attack, according to the Associated Press, which obtained the letter. He did not say what measures Ethiopia was taking.
Ethiopia Eritrea conflict: the self-defense letter
The letter accuses Eritrea of deploying infantry and mechanized units in recent weeks and of supporting, financing, arming and directing insurgent groups inside Ethiopia. It does not name the areas Ethiopia says are occupied or offer evidence for the claims, and the AP said it could not independently verify them. Gedion wrote that Ethiopia had repeatedly asked Eritrea to pull its forces back.
Eritrea’s information minister, Yemane Gebremeskel, responded on X by accusing Ethiopia of aggression through its demands for sovereign access to the Red Sea. He neither confirmed nor denied the reported troop crossings. In an earlier statement reported by AFP, he said Ethiopia was building “a fallacious narrative of ‘self-defence'” to justify what he called a war of aggression.
The diplomatic break came first. Ethiopia expelled 10 Eritrean diplomats and closed its embassy in Asmara earlier this month, and Eritrea responded by severing ties, a split covered in our report on how Ethiopia and Eritrea cut ties as the Tigray war widened. Prime Minister Abiy Ahmed repeated on Monday that landlocked Ethiopia must have access to the sea, while his Foreign Ministry said it remains open to dialogue.
Reports of Eritrean troops in Tigray
Several accounts this week placed Eritrean soldiers inside Ethiopia. Residents of the Tigrayan town of Adigrat told the BBC they watched trucks with Eritrean plates move south from the border town of Zalambessa, with one witness counting 20 to 30 large trucks heading toward Idaga Hamus on Wednesday morning. A source in Mekelle told the BBC that relatives estimated as many as 60 troop trucks.
The conflict monitor ACLED said Eritrean troops crossed at Zelambesa on Wednesday and came under drone attack near Guada while traveling toward Idaga Hamus, strikes it attributed to Ethiopia’s military. In a briefing note, ACLED said Eritrean forces entered the war “to halt the Ethiopian government and allied forces from reaching the border and potentially fighting within Eritrea’s territory.” Gebreigziabher Beyene, a commander of the pro-government Tigray Peace Force, told AFP that Eritrean units were in uniform with heavy weapons and were being hit by drones.
Government forces advance after Mekelle
Fighting between the Tigray People’s Liberation Front and federal forces broke out on Sept. 23, unraveling the 2022 peace deal. The TPLF, which joined six other opposition groups last month in an alliance seeking to remove Abiy, briefly held Mekelle before announcing its withdrawal on Oct. 3. Government-allied fighters then entered the city, as we reported when the Tigray capital Mekelle was retaken.
Ermiyas Ababu, a Tigray Peace Force commander, told the AP that government and allied forces took Idaga Hamus early Friday and Abiy-Adi, in the Tembien area, on Thursday afternoon. It was unclear who held those towns just before the advance or whether Eritrean troops took part in the fighting. In Mekelle, federal police used loudspeakers on Friday to ask residents to help form a new local administration, and government offices remained closed. The U.S. Embassy said telecommunications had resumed across much of Tigray, with banking and electricity partly restored.
Why a wider war worries the region
Eritrea won independence from Ethiopia in 1993, and the two fought a border war from 1998 to 2000. Relations warmed after Abiy took office in 2018, and Eritrean troops fought alongside Ethiopia’s army against the TPLF from 2020 to 2022. Researchers at Ghent University estimate that war caused about 500,000 civilian deaths in Tigray through violence, famine and the collapse of health services. During that conflict, the AP documented accounts accusing Eritrean soldiers of killings, rape and looting, allegations Eritrean President Isaias Afwerki dismissed in 2023 as “a fantasy.”
Britain and the United States have told their citizens to avoid travel to northern Ethiopia. The next signals to watch are whether the Security Council takes up Ethiopia’s letter, whether Eritrea formally acknowledges a deployment, and whether fighting moves toward the border itself.
Sources
- Associated Press (via WRAL): Ethiopia tells UN it is acting in self-defense against Eritrea
- AFP: Eritrean troops deploy in Ethiopia’s Tigray region
- BBC News: Eritrean troops move deep into Ethiopia, residents say
- Associated Press (via WSLS): Eritrean forces seen entering towns in Tigray
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