The finance minister has warned that spending cuts or a rise in other taxes could follow.
This is the deadliest known attack since insurgents began operating in Benin at the beginning of the decade.
At least nine people were killed and dozens injured, including children, in the attack in Ukraine, officials say.
Tanzanian bananas are among the things hit in the dispute after Malawi stopped them from entering.
Both parties reaffirm their commitment to an "immediate cessation of hostilities" in latest truce deal.
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