Niger accused France on Wednesday of violating its airspace, attacking a military camp and freeing "terrorists" to undermine the country. Paris denied the charges.
ECOWAS, a regional West African bloc, said it could activate its Standby Force to impose stability in Niger. Coup leaders have ignored previous invasion threats.
Nearly two weeks since the coup and Niamey's mostly quiet streets are interspersed with pro-junta rallies, anti-foreign rhetoric and residents waving Russian flags.