From May 28, 1938 on, the largest air battles in history up to that time, were fought in Asia and involved 140 to 200 Soviet and Japanese aircraft (A. Stella, Khalkhin-Gol, "The Forgotten War", Journal of Contemporary History, 1, 8, 1983).
Desde mayo 28 de 1939 las mas grandes batallas aéreas en la historia hasta ese entonces fueron peleadas en Asia e incluyeron de 140 a 200 aviones de Rusia y Japón (A. Stella, Khalkhin-Gol, The Forgotten War , Journal of Contemporary, History, 18, 1983).