LONDON (Reuters) – Airlines will need to negotiate Ukraine aviation cover with their insurers, with some of the required war risk policies now being agreed on a daily basis, a senior Lloyd’s market official said on Monday. Two Ukrainian airlines disclosed problems in securing insurance for some of their flights on Monday, while foreign carriers began avoiding the country’s airspace as Russia masses a huge military force on its border. “Most market leaders (insurers) gave 48 hours’ notice to exclude Ukraine as of Friday evening, which does not mean they have terminated or withdrawn cover. It me…