The Sahel Facing a New Security Architecture: Between Competing Military Alliances and Western Pragmatism

The Sahel region is undergoing a profound reconfiguration of its security landscape since the end of 2025, marked by the emergence of competing regional military structures and an unprecedented geopolitical realignment. This transformation occurs in a context where terrorist violence continues to intensify, despite more than fifteen years of international engagement and investments exceeding $3.3 billion from the United States alone.

The Alliance of Sahel States (AES), comprising Mali, Burkina Faso, and Niger, reached a decisive milestone in December 2025 with the operational deployment of a joint military force of 5,000 to 6,000 soldiers. This initiative, announced at the Niamey summit on December 19, represents much more than mere tactical coordination among three countries led by military juntas. It constitutes a strategic break from the previous security architecture, symbolized by the withdrawal of these three nations from ECOWAS and the dissolution of the G5 Sahel.

General Abdourahamane Tiani, president of the National Council for the Safeguarding of the Homeland in Niger, presented this unified force as the embodiment of "security autonomy" freed from Western oversight. However, this anti-imperialist rhetoric masks a more complex reality: the replacement of one dependency with another, as Russia becomes the main security partner of these three states. The personnel of the private military company Wagner, rebranded as Africa Corps, are said to have reached several hundred operators in the region, according to Western diplomatic sources consulted in January 2026.

In response to this Sahelian alliance under Russian influence, ECOWAS has reacted by accelerating the establishment of its own regional rapid reaction force. The ECOWAS Commissioner for Political Affairs, Peace, and Security, Abdel-Fatau Musah, confirmed in November 2025 the imminent deployment of a force of 1,650 personnel, with a goal of 2,000 soldiers by the end of 2026. This initiative is part of a more ambitious project announced in August 2025: the creation of a 260,000-strong counter-terrorism force with an annual budget of $2.5 billion.

The gap between these announcements and actual operational capabilities remains considerable. Analysts from the Institute for Security Studies question the viability of an ECOWAS force that would replicate the weaknesses of the defunct G5 Sahel: insufficient funding, failing inter-state coordination, and a lack of coherent political strategy beyond a military approach. The Unified Force of the AES, despite its more modest size, benefits from greater operational integration and a clear political will from its military leaders.

This regional fragmentation occurs as the terrorist threat reaches unprecedented levels. By the end of February 2026, an attack attributed to jihadist groups killed 25 people in the Tillabéri region of Niger, near the Malian border. Groups affiliated with Al-Qaeda (JNIM - Group for Support of Islam and Muslims) and the Islamic State (ISGS - Islamic State in the Greater Sahara) now control significant portions of territory in the three AES countries, despite the intensification of military operations.

The most unexpected development in this strategic landscape concerns the American re-engagement in the region, adopted under the Trump administration. After the forced withdrawal of its bases in Niger in 2024, including the costly drone facility in Agadez, Washington opted for a pragmatic approach described by General Brennan, commander of AFRICOM, as a shift "from military primacy to multidimensional engagement." This doctrine translates into the provision of intelligence to Mali, Burkina Faso, and Niger, despite their pivot towards Moscow, and the possibility of arms exports under strict conditions.

This posture reflects a tacit acknowledgment of the failure of previous approaches. Two decades of American security assistance, materialized through the Pan-Sahel Initiative (2002) and then the Trans-Saharan Counter-Terrorism Initiative (2005) covering eleven countries, did not prevent the deterioration of security. The number of victims linked to jihadist violence multiplied tenfold between 2015 and 2025 according to data from the Armed Conflict Location & Event Data Project (ACLED).

The American strikes on December 25, 2025, against Islamic State positions in northwestern Nigeria illustrate this new doctrine. President Trump presented them as "a powerful and deadly strike against the terrorist scum of Daesh," promising "many more." These targeted operations, without the deployment of ground forces, are part of a strategy of remote threat management rather than total eradication.

Nigeria, the region's leading economic and demographic power, plays a pivotal role in this reconfiguration. Confronted with a Boko Haram insurgency in the Lake Chad basin for fifteen years, Abuja surprised in December 2025 by requesting French security support, thus breaking with the regional trend of disengagement from former colonial powers. This request comes after Paris was forced to withdraw its forces from Mali, Burkina Faso, and Niger between 2022 and 2024, ending Operation Barkhane, which had deployed up to 5,100 soldiers in the region.

The foreign ministers of Nigeria, Ghana, and Sierra Leone explored strategies for "rebuilding regional order" in the face of current fragmentation during a conference at Chatham House on March 9, 2026. Their discussions highlighted the cross-border dimension of Sahelian insecurity: armed groups do not recognize state borders and exploit the gray areas between national jurisdictions.

The effectiveness of the new security architectures remains to be demonstrated. The Unified Force of the AES has no structural advantage over previous arrangements, except for stronger political integration among military regimes sharing a similar nationalist ideology. ECOWAS forces suffer from the same chronic limitations as the G5 Sahel: dependence on external funding, inadequate equipment, and fragmented intelligence.

Beyond the military question, the exclusively security-focused approach characterizing both the AES and ECOWAS perpetuates the mistakes of the past. Experts gathered at the Chatham House conference emphasized that the increasing militarization of the Sahel, far from defeating terrorism, fuels a cycle of violence that has already claimed tens of thousands of civilian lives. The human rights violations documented by Human Rights Watch in its February 2026 report on Mali, Burkina Faso, and Niger show that government forces and their militia auxiliaries contribute to insecurity themselves.

The discovery in May 2025 of two mass graves containing 22 bodies in the Diafarabé region of Mali, attributed to Malian forces accompanied by Wagner fighters and Dozo militiamen, illustrates this drift. Survivors confirmed that the victims, accused of collaborating with JNIM without evidence, had been summarily executed. Such incidents fuel cycles of retaliation and facilitate jihadist recruitment in targeted communities.

The question now arises whether the competition between the AES and ECOWAS will serve the security interests of Sahelian populations or merely add another layer of complexity to an already unmanageable crisis. Recent history suggests that the multiplication of military initiatives without political coordination or a comprehensive approach integrating governance, development, and human rights will yield only limited, if not counterproductive, results.

The coming months will be decisive. The effective deployment of the 2,000 ECOWAS soldiers by the end of 2026 and the first joint operations of the Unified Force of the AES will provide concrete indicators of the viability of these new structures. In the meantime, Sahelian populations continue to endure violence that shows no signs of abating, fifteen years after the onset of this crisis that profoundly redefines the security balances of West Africa.