sentences:  2007 Shatoy Mi-8 crash
  
  The 2007 Shatoy Mi-8 crash occurred on April 27, 2007, when a Russian military Mil Mi-8 helicopter carrying special forces troops and officers crashed in mountainous terrain in southern Chechnya, killing all 20 people on board.The incident is the largest officially acknowledged loss of life for federal troops in Chechnya in 2007 and the worst Russian military aircraft disaster since August 2002, when an enormous Mil Mi-26 transport helicopter packed with troops crashed into a minefield after being hit by a missile, killing 20 soldiers.