Former Bolshoi star Andris Liepa and the Kremlin Ballet of Moscow have been using photographs, notes, paintings, set and costume designs, and other sources to reconstruct seven of Diaghilev’s most storied ballets, including L’Après-midi d’un faune, Firebird, Le Dieu bleu and Nijinska’s original Boléro. In addition to performances in the West (they open in London this week), Liepa and his company bring these works to provincial Russia, where they had never been seen.