The export ban is aimed at keeping the Russian domestic market well supplied with grain after Russia, which the world’s third largest wheat exporter last year when it sold 21.4 million tonnes of grain, after the country suffered a record drought which destroyed a quarter of its harvest.

Forest and brush fires flared up again on Thursday, killing two people and burning down more than 160 houses and buildings. Mr Putin is keen to avoid any signs of social unrest ahead of elections due in 2012.

The export ban from such a key global exporter sent wheat prices to 231.5 euros a tonne, just short of last month’s two-year high of 236 euros, sparking worries of a crisis in global food supplies.

A rise in the price of state-controlled food, water and electricity prices have sparked protests in Mozambique where seven people have been killed and hundreds left injured after clashes with police. The price of a loaf of bread is due to rise by 25 per cent on September 6.

The Rome-based FAO said that their emergency meeting was called due to “an enormous number” of inquiries over concerns “about a possible repeat of the 2007-08 food crisis”

Abdolreza Abbassian, of the FAO, said: “This is quite serious. Two years in a row without Russian exports creates quite a disturbance”.

The rising prices around the world have raised concerns about a return to the political instability in 2008, when Haiti, Kenya and Somalia were among those that saw rioting over the cost of living