Russia's exit from the Ukraine grain deal means that "greater instability will come into the market", according to humanitarian charity Christian Aid. Speaking in an interview with AFP, Lydia Mbogoro, the charity's Humanitarian and Hunger Policy Adviser, warns that "the countries that will be most affected will most likely be vulnerable countries", including those already suffering from humanitarian crises. "What we could see is a situation which could further deteriorate" says Mbogoro. On Monday, Russia refused to extend the deal, which allows Ukrainian grain to pass through the Black Sea. IMAGES AND SOUNDBITES