All three were suspended from ECOWAS, with Niger and Mali facing heavy sanctions.
They have hardened their positions in recent months and joined forces in an “Alliance of Sahel States”.
A French military withdrawal from the Sahel — the region along the Sahara desert across Africa — has heightened concerns over the conflicts spreading southward to the Gulf of Guinea states Ghana, Togo, Benin, and Ivory Coast.
The prime minister appointed by Niger’s military regime on Thursday blasted ECOWAS for “bad faith” after the bloc largely shunned a planned meeting in Niamey.
Niger had hoped for an opportunity to talk through differences with fellow states of ECOWAS, which has cold-shouldered Niamey, imposing heavy economic and financial sanctions following the military coup that overthrew elected president Mohamed Bazoum.