El Pais published on 23 December 2023 an article titled "Russia Expands into the Sahel with Its New Brand: Africa Corps" by Jose Naranjo.
Africa Corps is Russia's new armed mercenary organization directly linked to the Ministry of Defense and designed to replace the infamous Wagner Group. Mali, Burkina Faso, and Niger are developing closer ties with Russia and, presumably, the new Africa Corps.
For additional information on the Africa Corps see the Business Insider's 22 December 2023 article titled "A New Russian Military Formation in Africa with the Same Name as a Nazi Unit Is Trying to Recruit Former Wagner Fighters and Ukraine War Vets" by Jake Epstein.