NEW : CNN 's Alla Eshchenko contributed to this report . Experts from Britain , France and Germany will help investigate . The twin - engine plane crashes soon after takeoff , killing 43 people . The cause of the crash was not immediately known . The crash is Russia 's worst air disaster since a crash in Yaroslavl last year .
NEW : Experts from Britain , France and Germany will help investigate . The twin - engine plane crashes soon after takeoff , killing 43 people . The cause of the crash was not immediately known . The crash is Russia 's worst air disaster since a crash in Yaroslavl last year .