Although his early paintings looked back at his youth in the Ukraine, in 1919 he exhibited 50 paintings at "Au Tableau d'Art" reflecting the war years and with portraits of Parisiens, after which he was well known in Montparnasse, earning the moniker of "le Montparno des Montparnos".
Sacha was a prolific artist up until World War II, when the German occupation and Vichy France limited his professional activities, but he & his wife survived the war while losing his closest artist friend, Samuel Granovsky, to the Nazi concentration camps.