this is bbc news. i m tim willcox. our top stories: ukraine and russia sign a deal allowing the resumption of ukrainian grain exports from ports on the black sea. the un says the deal must not fail. many people are at risk of famine, so there is a moral obligation on all those involved in this process to make it a success. we report from the farms on the frontline in the donbas region, which have now become a battleground. a deal to end russia s blockade could make a huge difference but it won t end the war and so, here in the donbas, ukrainian farmers are racing to harvest and to store what they can, whatever the risks. steve bannon, the former aide to president trump,