Benin's president has again called on Niger's military rulers to collaborate and reopen their side of the border to allow oil exports via his country.
Benin has eased trade restrictions on its side of the Niger border, after sanctions were imposed on Niger following a coup in July last year.
But Benin President Patrice Talon has, for weeks, complained that Niger's rulers were not cooperating to restore ties and formally normalise trade.
"The Nigerien authorities must officially say that oil is exempted from the closing of their land border", he said on Thursday, adding that this would "allow a different statutory treatment for oil coming from Niger."
Minimal step
"Without this minimal step, all oil custom formalities are impossible between Benin and Niger."
Landlocked Niger runs a pipeline from its oilfields to Benin's Seme port on the Atlantic coast to export its crude.
The Benin president has been pushing for the military rulers to formally normalise trade, rather than allow informal border crossings.
"If you want to load your oil in our waters, you must consider that Benin is not an enemy country and that the territory of Benin cannot be the subject of illicit trafficking or informal exchange," he said in a statement in early May.
Cost of food
Benin had already announced it would reopen its border, but Niger's military rulers have so far kept their side of the frontier closed.
The closure of Benin's northern border with Niger hit Benin's government revenues and also impacted the cost of food goods.
Last year, Talon had been among the most vocal regional leaders calling for relations to be swiftly re-established between his country and Niger following the coup in Niamey.
Niger has been able to sell crude on the international market for the first time via Seme.
➤ Click here to follow our WhatsApp channel for more stories.