Ethiopia-Eritrea Severance of Diplomatic Relations: Will the Tigray Spark Spread Across the Entire Horn of Africa?
Executive Summary
Ethiopia severed diplomatic relations with Eritrea following the rearmament of the Tigray People's Liberation Front (TPLF) and the formation of the "Survival Alliance." With the expulsion of Eritrean diplomats and a suspected drone attack in Addis Ababa, the likelihood of a direct conflict between the two nations is rising. The 2018 reconciliation was merely a temporary convergence based on a common enemy, the TPLF, and the fundamental conflict of interest between Ethiopia and Eritrea over access to the Red Sea remains unresolved. Ethiopia's military leadership has accused not only Eritrea but also Sudan and Egypt of supporting the rebels. These countries present different variables: Egypt seeks leverage in the Nile water dispute, while Sudan faces a foreign policy vacuum due to its own civil war. The seizure of Mekelle Airport and the expansion of the front lines into Afar and Amhara demonstrate the potential for the conflict to spread beyond Tigray into multilateral tensions across the entire Horn of Africa. Whether key logistics hubs like Bole Airport and the Djibouti Corridor remain functional will likely be a turning point for regional supply chain risks. Businesses and governments need to reassess their logistics and investment exposure in Ethiopia and proactively consider alternative supply chain routes in response to rising cross-border tensions in the region.
I. Analysis of the Current Situation
A Night in Addis Ababa: Explosions Signal the End of the Peace Agreement
From the 2018 Nobel Peace Prize to the 2026 Severance of Diplomatic Relations
When Ethiopian Prime Minister Abiy Ahmed received the Nobel Peace Prize in 2018 for normalizing relations with Eritrea, the reopening of the Ethiopian Embassy in Asmara was its symbol [12]. Eight years later, that embassy has closed. On Thursday, October 1, the Ethiopian Ministry of Foreign Affairs announced the closure of the Asmara embassy, calling it a "response to Eritrea's direct and indirect hostile acts and belligerent attitude" [12]. Ten Eritrean diplomats were ordered to leave the country within 48 hours [4][12].
The trigger for the severance of diplomatic ties was the resurgence of armed conflict in the Tigray region. The civil war, which lasted from 2020 to 2022 and is estimated to have claimed up to hundreds of thousands of lives, was temporarily resolved by the 2022 Pretoria Peace Agreement [7][14]. However, the Tigray People's Liberation Front (TPLF) rearmed last week without fully resolving tensions with the federal government [as of September 29 reports]. Under the name "Ethiopian People's Army Survival Alliance," the TPLF formed a coalition with seven domestic armed groups, and this alliance has seized several strategic strongholds from the federal forces [16].
Field Marshal Birhanu Jula, Chief of Staff of the Ethiopian National Defense Force, accused Eritrea on Friday, September 26, of organizing financial support for the TPLF [15]. He went further to claim that Sudan and Egypt are also supporting the rebel alliance [2][15][16]. All three countries deny these allegations [7].
Not Artillery, but Drones Hit the Capital
On the night of October 1, a powerful explosion was heard near the military headquarters in Addis Ababa. Diplomatic sources reported that it was suspected to be a drone strike [1][10]. The Wall Street Journal reported this as an event that fuels "fears that Ethiopia's internal conflict could spill over into a direct war between Ethiopia and Eritrea" [10]. The explosion occurred hours before the announcement of the severance of diplomatic relations [10][14].
Al Jazeera diagnosed the situation as "the diplomatic front expanding into the geopolitical realm" [4]. As Ethiopia, Eritrea, and Egypt plunge into a rapidly deteriorating diplomatic standoff, concerns are growing that the friction could spill over borders and draw in competing regional and global powers in the Horn of Africa [4]. The Daily Maverick characterized the clash as "the largest escalation of fighting within Ethiopia since the end of the 2020–2022 civil war" [7].
The military progress of the rebel alliance is also rapid. Mekelle Airport has been seized by the TPLF, and Ethiopian Airlines has completely suspended flights on that route [EAI 990701]. The front lines appear to be expanding into the Afar and Amhara regions [EAI 990701]. However, key logistical arteries, such as Addis Ababa Bole International Airport and the Djibouti-Ethiopia land corridor, have maintained normal operations so far [EAI 990701].
Who Wants What, and Why?
The position of the Ethiopian federal government is clear. The official narrative led by Chief of Staff Jula frames the TPLF uprising not as a purely domestic rebellion, but as "external intervention backed by Eritrea, Sudan, and Egypt" [2][15]. This framing can be read as an attempt to explain military setbacks through external factors while also securing a justification for intervention by regional bodies like the African Union (AU).
Eritrea was a key party that drove reconciliation with the Abiy government after 2018, but this time it stands on the opposite side. While the Asmara government completely denies the allegations of supporting the TPLF [7], it immediately responded to Ethiopia's expulsion of diplomats and embassy closure by severing diplomatic ties [4]. Given that the TPLF was a hostile force that Eritrea fought against alongside Ethiopia during the 2020–2022 civil war, it remains unclear whether the current phase represents a reconfiguration of past front lines or pure geopolitical calculation.
Paradoxically, Sudan is identified as a key variable in the Tigray situation due to its own ongoing civil war. German public broadcaster DW examined whether Ethiopia is exposed to the risk of a proxy war under the headline "The Sudan Connection" [16]. Egypt is a party that has maintained long-standing tensions with Ethiopia over the Nile water dispute surrounding the Grand Ethiopian Renaissance Dam (GERD). The Council on Foreign Relations (CFR) analyzes that the very fact that "the Ethiopian military commander claimed Egypt and Sudan are supporting Tigrayan rebels" is a sign of interstate and domestic conflicts becoming entangled across the Horn of Africa [2].
The AU has issued a statement calling for restraint regarding the current situation, but its actions—such as signing a memorandum of understanding (MOU) on peace research cooperation with SIPRI during the UN General Assembly High-Level Week in New York—suggest it is focusing more on building institutional foundations than on conflict mediation [8]. The fact that Ambassador Bankole Adeoye, Commissioner for Political Affairs, Peace and Security of the AU, led the signing [8] indicates that the regional security crisis response system is prioritizing mid-to-long-term research cooperation over immediate mediation.
The Issue is Not "Whether It Will Escalate" but "The Path of Escalation"
In the current phase, the core issues converge on three points. First is whether the situation will transition into a direct armed conflict between Ethiopia and Eritrea. The fact that the severance of diplomatic ties and the suspected drone attack occurred within 48 hours of each other [4][10][14] demonstrates that the speed at which diplomatic rhetoric translates into military action is faster than in the past.
Second is the veracity and impact of the alleged Sudanese and Egyptian intervention. Whether or not the claims of the Ethiopian military leadership are verified, the assertion itself serves to link existing axes of conflict—namely the GERD dispute and the Sudanese civil war—to the Tigray situation [2][16].
Third is the vacuum in regional mediation mechanisms. Although the AU is calling for restraint, there are no signs yet of a concrete mediation roadmap or the reactivation of an agreement model like the 2022 Pretoria Agreement. Given that the Horn of Africa is already a region entangled with the Djibouti-Somaliland base competition over the Red Sea and the Bab-el-Mandeb Strait, as well as tensions stemming from the Houthi rebels in Yemen [9][5], the key point to watch over the coming weeks is whether the Tigray-born crisis will remain an independent variable or resonate with existing multi-layered regional tensions.
II. In-Depth Analysis
Why the Border is Burning Again: The Unfinished Calculus of the 2018 Reconciliation
The Gap Between the Rhetoric of "Brotherly Nations" and Actual Interests
When Eritrean President Isaias Afwerki and Prime Minister Abiy Ahmed shook hands in 2018, the relationship between the two countries was packaged in the language of "brotherhood." However, the actual driver of that reconciliation was a common enemy. In the face of the shared threat of the TPLF, the interests of Addis Ababa and Asmara merely converged temporarily. During the 2020–2022 civil war, Eritrean forces entered the Tigray region alongside the Ethiopian federal army to attack the TPLF. At the time, the two countries were united by the simplest logic: "the enemy of my enemy is my friend."
The problem was that this union was structured in a way that left no reason for it to continue once the target, the TPLF, was gone. Following the Pretoria Peace Agreement, as the TPLF disarmed and entered into a tentative compromise with the federal government, the sole adhesive holding Ethiopia-Eritrea relations together weakened. From Eritrea's perspective, the complete eradication of the TPLF was actually an unwelcome outcome. A stable federal government presence taking root in the Tigray region would mean the resurgence of a "strong Ethiopian central power," which Eritrea has long guarded against.
In addition, an older conflict over access to the Red Sea runs beneath the surface. Since becoming landlocked following Eritrea's independence in 1993, Ethiopia has relied entirely on the Port of Djibouti for its logistics. In recent years, Prime Minister Abiy has publicly raised the need to secure maritime access, which was interpreted as a direct threat signal by Eritrea, which possesses the Port of Assab. The rearmament of the TPLF provides Eritrea with an opportunity to divert the capabilities of the Ethiopian federal forces into Tigray rather than toward the northern border. The official Ethiopian narrative behind Field Marshal Birhanu Jula's public accusation of Eritrea "organizing financial support" [15] is that Asmara's strategic calculation goes beyond merely supporting the rebels to tying down Ethiopia's military power.
Three Borders, Three Calculuses
Viewing this situation solely through the lens of an Ethiopia-Eritrea bilateral dynamic misses the core issue. The three countries identified by Chief of Staff Jula—Eritrea, Sudan, and Egypt—are driven by distinct motivations [2][15][16].
Egypt's calculus is the clearest. The Nile water dispute surrounding the operation of the Grand Ethiopian Renaissance Dam (GERD) has been a fundamental fault line between Cairo and Addis Ababa for over a decade. Egypt believes that the more Ethiopia is bogged down by internal security crises, the greater the room for Cairo to extract concessions from Addis Ababa regarding leverage over the dam's operation. The CFR explains the context behind the allegations of Egypt and Sudan supporting Tigrayan rebel forces as an "entangled web" of interstate tensions and domestic conflicts across the Horn of Africa [2].
Sudan's case is of a different nature. Sudan itself is in a state where state functions are largely paralyzed due to the civil war between the Rapid Support Forces (RSF) and the Sudanese Armed Forces. Questions are raised as to whether Sudan even has the capacity to execute a coherent foreign strategy at the state level. DW points out that the picture of a "cross-border alliance" painted by the Ethiopian military leadership may be exaggerated compared to reality, but notes that it is an undeniable fact that the TPLF-led coalition has bound seven domestic armed groups under the name of the "Ethiopian People's Army Survival Alliance" [16].
The fact that all three countries deny the allegations cannot be overlooked either [7]. In the absence of official verification regarding the reality of external support, the Ethiopian federal government's theory of a triangular backing also functions as a political narrative to explain military setbacks. Framing a domestic rebellion as foreign intervention makes it easier for the federal government to rally public support. At the same time, it can shift the justification for international involvement from a "civil war" to "responding to a violation of sovereignty."
Differences and Similarities Compared to 2020
It is difficult to view the current phase as a simple repetition of the 2020–2022 civil war. At that time, the TPLF faced the federal forces alone. The current rebel coalition is structurally different in that it is a multilateral alliance of seven armed groups [16]. While negotiations with a single entity allow for localized settlements, a coalition of heterogeneous groups makes even a comprehensive ceasefire difficult to agree upon due to the diverse demands of each faction. Considering that the 2022 Pretoria Agreement was signed only with the TPLF leadership, the possibility that some members of the current coalition were outside the framework of the agreement cannot be ruled out.
Similarities are found in the patterns of external intervention. During the 2020 civil war, Eritrean forces officially denied intervention while actually being deeply involved in the Tigray operations. This time as well, Eritrea denies the allegations of support [7]. The pattern where intervention in the form of a "proxy war" in interstate conflicts occurs before, or separately from, the severance of official diplomatic channels is close to a recurring characteristic of conflicts in the Horn of Africa. This can be compared to the dynamic in Yemen, where Iran maintains proxy tensions with Saudi Arabia through the Houthis [5][11]. Avoiding direct engagement while draining the adversary's national strength through proxy forces is a typical choice for small and medium-sized states seeking to pursue strategic goals while avoiding the costs of all-out war.
However, the decisive difference this time is that a drone strike reached the heart of the capital [1][10]. During the 2020–2022 civil war, fighting was largely confined to the Tigray region or the adjacent Amhara and Afar regions. The explosion near the military headquarters in Addis Ababa is perceived as a signal that the geographical scope of the conflict could expand to the capital [10][14]. This is a pattern that did not emerge even during the worst phases prior to the 2022 agreement.
Structural Dilemma of the African Union
The fact that the African Union (AU) headquarters is located in Addis Ababa encapsulates the paradox of this situation. The structural constraints on a regional organization headquartered in the capital of a conflict party having to call for restraint from that very host nation are not simple. The AU's recent signing of an MOU for peace research cooperation with the Stockholm International Peace Research Institute (SIPRI) [8] can be read as an attempt to institutionally reinforce regional conflict prevention capabilities. However, there is a significant gap between signing an MOU and actual conflict mediation power. Although the AU positioned itself as a mediator during the 2020–2022 civil war, the final settlement was reached in Pretoria, South Africa. The reality that an organization headquartered in Addis Ababa faces structural limitations in exerting pressure on the Ethiopian federal government is highly likely to be repeated this time as well.
Three Key Variables Shaping the Future
The variables that will determine the trajectory of this issue fall into three broad categories.
First is the actual level of Eritrea's intervention. While severing ties and expelling diplomats represent the highest level of diplomatic action, they signal a different level of intensity compared to direct military intervention. The watershed moment will be whether Eritrea goes beyond financial and material support for the TPLF to deploy its own forces across the border once again. Considering the 2020 precedent, Eritrean military intervention is highly likely to proceed covertly without official announcements, potentially repeating a pattern where diplomatic tensions escalate first while verification of the intervention is delayed.
Second is the cohesion of the rebel alliance. The federal government's response strategy will vary depending on how long the seven heterogeneous armed groups can maintain a united front under a common goal. If conflicts of interest among factions within the alliance are exposed, the federal government will be able to pursue divide-and-conquer negotiations; however, as long as cohesion is maintained as it is now, a single negotiation track like the Pretoria model will be difficult to operate.
Third is whether the Egyptian and Sudanese variables materialize. So far, the situation remains at the stage of accusations and denials [7]. However, if the Nile River dispute over the GERD is reignited, or if the Sudanese civil war enters a lull, allowing either the RSF or the government forces to secure the capacity for external intervention, the conflict in the Horn of Africa is highly likely to transition from a bilateral to a multilateral framework. This is also a key variable determining how long the assessment of the Djibouti Corridor and Bole Airport "maintaining normal operations so far" [EAI 990701], as noted in EAI's previous analysis, will hold.
References
[4] [DW (Deutsche Welle)] Eritrea: Diplomatic ties collapse as Ethiopia conflict grows
[10] [The Wall Street Journal] Drones Strike Ethiopia’s Capital as Country Severs Ties with Eritrea
[11] [Sana'a Center] The Yemen Review Quarterly: April-June 2026
[12] [DW (Deutsche Welle)] Ethiopia and Eritrea sever ties amid Tigray fighting
[14] [Hiiraan Online] Ethiopia and Eritrea cut diplomatic ties as northern conflict escalates
[16] [DW (Deutsche Welle)] The Sudan connection: Is Ethiopia at risk of a proxy war?
[17] [Al Jazeera] Ethiopia, Eritrea break ties: Does the conflict risk becoming regional war?
[18] [Times of Oman] The Sudan connection: Is Ethiopia at risk of a proxy war?
[20] [BusinessDay (NG)] Explosions reported in Addis Ababa as Ethiopia conflict spreads north
[21] [Al Jazeera] Blasts heard in Addis Ababa as Ethiopia conflict widens in the north
[22] [Foreign Policy] Ethiopia’s Return to War Threatens to Engulf the Horn of Africa
[23] [Al Jazeera] Ethiopia blames regional rivals as risk of conflict spillover rises
[24] [Kuwait Times] Explosion overnight at Ethiopian army HQ in capital
*This text is an AI translation of an original written in Korean. Some translations or nuances may be inaccurate.
This report is an in-depth analysis planned by an EAI researcher, grounded in sophisticated AI-assisted research, and finalized by the EAI researcher.
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