He was promoted to Komkor and replaced Komdiv N.M. Rogowski as the chief of the artillery of the Red Army, who was later shot during the Case of Trotskyist Anti-Soviet Military Organization, on 20 June 1937. Voronov started work on the modernization of the Red Army artillery, and in November 1937 submitted a memorandum to Kliment Voroshilov on the modernization of the artillery. At the end of July 1938 Voronov went as part of a special commission of the People's Commissariat of Defence to test the combat training of the Far Eastern Military District during the Battle of Lake Khasan. In June 1939, he was sent to Khalkhyn Gol to lead the 1st Army Group's artillery during the Battles of Khalkhin Gol. For his actions during the battle, Voronov was awarded a second Order of the Red Banner.