Ukraine bans all Russian planes from using its airspace as Russian state-controlled energy giant Gazprom stops delivering gas to its neighbour.
Rolls-Royce chief executive Warren East says he understands investors' concerns and promises to be more transparent about the risks it faces.
British Airways and Easyjet cancel all flights between the Egyptian resort of Sharm el-Sheikh until January, in the wake of last month's Sinai plane crash.
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