a deal brokered by the united nations to allow ukraine to export grain is due to expire later on monday. under the arrangement russia agreed to allow shipments to leave ukrainian ports despite its blockade. more than 32 million tons of wheat and other cereals have been exported but russia has threatened to end the arrangement, saying it is one sided. wright will have more details on this in 20 minutes. the owner of twitter, elon musk, says the company has lost almost half its advertising revenue since he bought the social media platform last october. mr musk tweeted that his hopes of returning twitter to a positive financial position byjune had not materialised, but he said this month was looking more promising. 55 pilot whales have died after a mass stranding on a beach in the western isles of scotland. most were found dead early yesterday morning. however, one whale was successfully refloated. despite a major operation