 In 1930 , Mikhail Tukhachevsky , a prominent military theorist in tank warfare in the interwar period and later Marshal of the Soviet Union , forwarded a memo to the Kremlin that lobbied for colossal investment in the resources required for the mass production of weapons , pressing the case for " 40 @,@ 000 aircraft and 50 @,@ 000 tanks " . In the early 1930s , a very modern operational doctrine for the Red Army was developed and promulgated in the 1936 Field Regulations in the form of the Deep Battle Concept . Defense expenditure also grew rapidly from just 12 percent of the gross national product in 1933 to 18 percent by 1940 . 
