at Lipetsk The Treaty of Versailles, signed on 28 June 1919, prohibited Germany from operating any form of air force after the country had lost the First World War. Initially, it also prohibited the production and import of any form of aircraft to the country. In 1922, the clause on civilian aircraft was dropped and Germany was able to produce planes again, followed in 1923 with the country regaining control of its airspace. The operation or production of aircraft for military means was however still prohibited. Initially, Germany was unwilling to break the Treaty of Versailles. This attitude changed however in 1923, when French and Belgian troops occupied the
Ruhr area after Germany defaulted on reparations payments. In light of the events of the
Ruhrkampf, the German Army ordered 100 new aircraft from
Fokker in the Netherlands, among them 50 newly developed
Fokker D.XIIIs. Additionally, the German Navy had also ordered a small number of planes. With the end of the
Ruhrkampf in September, Germany was at a loss as to how to utilize the planes which were due for delivery in 1924. The Soviet Union was approached and showed an interest in allowing Germany to develop aircraft in the country; the German manufacturer
Junkers had already been operating a production facility for military aircraft
near Moscow since 1923. In June 1924, retired Colonel
Hermann von der Lieth-Thomsen became a permanent representative of the ''Reichswehr's
Truppenamt'', the secret General Staff of the German Army, in Moscow. At the same time, seven German instructors were sent to the Red Air Force. On 15 April 1925, Lieth-Thomsen signed a contract to establish a German fighter-pilot school at Lipetsk. ==Fighter school==