The so-called "G5 Sahel" countries just south of the Sahara -- Burkina Faso, Chad, Mali, Mauritania and Niger -- have pledged to fight jihadists on their own soil with instability and Islamist attacks on the rise.
Based in Mali, the 5,000-strong G5 Sahel force is designed to bolster the 12,000 UN peacekeepers and France's own 4,000-strong military operation known as Barkhane operating in the region.
Macron will attend a summit on July 2 with the leaders of the African nations involved, "marking a new step" as the force is formally launched, a source in the French presidency told AFP yesterday.
The new force will support national armies trying to catch jihadists across porous frontiers.
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Macron visited Gao in northern Mali in May, his first foreign visit as president outside Europe, and said French troops would remain "until the day there is no more Islamic terrorism in the region".
France launched an intervention to chase out jihadists linked to Al-Qaeda who had overtaken key northern cities in Mali in 2013.
Macron is hoping that the 50 million euros (USD 57.2 million) the European Union has pledged to the Sahel force will be supplemented by extra support from Germany, the Netherlands, Belgium and the United States, which already has a drone base in Niger.
The French president will specify the final details of his nation's support on Sunday, but the focus is expected to be on help with equipment.
The UN Security Council has unanimously adopted a resolution that welcomes the G5 Sahel deployment but does not grant it UN authorisation, and France was forced to drop a request for a special UN report on financing for the force.
The question of funding is sensitive as Chad's leader Idriss Deby has said that for budgetary reasons his troops cannot serve simultaneously at such high numbers in the UN peacekeeping mission and also in the new force.