Rebel groups accused the interim government representatives of creating a “bad atmosphere” at talks and announcing the August 20 national dialogue without any consultation.
UN chief Antonio Guterres said fertiliser and energy prices rose in the past year, adding they would impact all harvests including rice and corn.
“A combination of violence, insecurity, deep poverty and record-high food prices is exacerbating malnutrition and driving millions to the fringes of survival,” according to the UN.
As violence aggravates existing crises, 15% of Burkina Faso's population is currently faced with food insecurity, and 1 in 10 children suffer from malnutrition, says the Red Cross.
Mali says it killed 203 militants in the central region last month, but activists and Human Rights Watch say some 300 civilians were massacred in "the worst single atrocity" reported in the country's decade-long armed conflict.
Mali's army also said that it seized large quantities of weapons, according to the statement.
The French president is learning yet another hard lesson in foreign policy mere weeks before the April presidential election.
Attack on lorry in Tillaberi region, a flashpoint zone where frontiers of Niger, Burkina Faso and Mali converge, leaves 18 people dead and many wounded, officials say.
Malian authorities said columns of armed insurgents on motorbikes had pinned down the army unit, but the troops killed more than 50 militants despite losing eight of their own.
While some analysts fear further destabilisation in a region mired in conflict, others suggest the withdrawal of a largely unpopular foreign military presence could lead to welcome intra-Malian and regional dialogue.
France lowers its flag and hands over keys of a military base to Mali's military, a withdrawal that comes amid growing local opposition to its presence in the volatile African region.
Greek forces could be deployed in Africa under last week's deal, which has been described by the government as historic but drawn massive criticism from the opposition parties as the move could expose Greece to numerous threats.
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