They “will implement all necessary measures in accordance with the G5 founding convention, notably Article 20,” they said.
The article says that the alliance can be dissolved at the request of at least three member states.
The G5 was created in 2014 but has secured only meagre results.
In 2017, leaders of the five countries agreed to deploy a joint anti-terror task force backed by France.
But the military rulers of Burkina Faso, Niger and Mali have all accused Paris of having an outsize role after years of French deployments on their territories.
Burkina Faso and Niger said in a statement on Saturday that they had decided “to quit all instances of the G5 Sahel, including the joint force“.
“Worse, the legitimate ambitions of our countries, of making the G5 Sahel a zone of security and development, are hindered by institutional red tape from a previous era, which convinces us that our process of independence and dignity is not compatible with G5 participation in its current form.”
Since the creation of the joint anti-terror force, violence has continued to spread, leaving thousands of civilians and fighters dead and displacing millions.
It has also contributed to political instability in the region, which has seen a succession of military coups.
Source : France24