Niger's coup leaders have recalled their country's ambassador in Ivory Coast saying comments by the Ivorian president had amounted to "praising armed action" against them.
Alassane Ouattara had spoken of his determination to see Niger's democratically elected leader Mohamed Bazoum reinstated, on his return from a regional summit last week.
He had also said a military operation to restore democracy in Niger should start "as soon as possible".
He said Ivory Coast would contribute between 850 and 1,100 troops, alongside Nigeria and Benin.
The West African regional bloc Ecowas has reaffirmed its preference for a diplomatic resolution - but says military intervention remains on the table.
The bloc said it was shocked that the coup leaders had decided to pursue prosecution against Mr Bazoum for high treason.
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