The leaders of the G-Sahel countries and France agreed on Monday to unite their forces under a joint command structure to fight Islamist militants in the Sahel region.
France promised to send an extra 220 soldiers to bolster a 4,500 troops already operating in the region.
French President Emmanuel Macron said that his country has no choice. He added that it needs results.
Militants linked to al Qaeda and Islamic State have intensified attacks, making vast areas of territory ungovernable and stoking ethnic violence, especially in Mali and Burkina Faso.
In a joint statement, the six leaders said they would focus their efforts against Islamic State in the Greater Sahara and they urged the United States to continue its logistical support for their forces.