The three Sahel countries had announced in January they were leaving the Economic Community of West African States, which they accused of being subservient to former colonial ruler France and failing to support them in their fight against jihadist violence.
Their departure becomes effective one year after the announcement, in January 2025, according to the bloc.
The trio have formed the Alliance of Sahel States after severing ties with France and pivoting towards Russia.
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ECOWAS appointed Senegal’s Faye as a “facilitator” in July to try to get them to remain in the bloc.
Faye who spoke ahead of an ECOWAS summit scheduled for Sunday, according to an official from the regional bloc also called for reform of the organisation.
Faye said the progress made by the bloc, such as improved movement of people and goods, must not be masked by problems of governance which, like many multilateral institutions, require reform to adapt them to the challenges of our time.
The 15-member ECOWAS has been shaken by a string of coups since 2020.
Faye, who swept to victory in March on a platform of radical change, was in the United Arab Emirates and Qatar to shore up investment support for his plan for economic transformation.