Russia has warned that military intervention in Niger would lead to a "protracted confrontation" after regional bloc Ecowas said it would assemble a standby force.
West African nations have approved armed intervention in Niger "as soon as possible", the Ivory Coast president says, following a meeting to discuss the coup.
The six people who have been arrested in connection with the killing of Ecuadorian presidential candidate Fernando Villavicencio are Colombian, police say.
Niger’s junta leader Gen Abdourahmane Tchiani has appointed a cabinet in defiance of calls by regional leaders to restore ousted President Mohamed Bazoum.
Delegations from Mali's and Burkina Faso's military governments have assured Niger’s military coup leaders of their full support in a solidarity visit to Gen Abdourahamane Tchiani in Niamey, the Nigerien capital.
Nigeria's President Bola Tinubu is facing a huge backlash at home over his threat to use military force to reverse the coup in next-door neighbour Niger.