A hidden dimension to German-Soviet ties entailed clandestine military cooperation, initiated under Lenin.208 Versailles had imposed severe restrictions on the German military’s size, training, weapons production, and even the ability to send military attachés abroad, but the Soviets offered to allow Germany to violate these restrictions. Major German manufacturers (Blohm & Voss, Krupp, Albatrosswerke) were able to build submarines, aircraft, and artillery on Soviet territory, and the Reichswehr obtained secret training facilities. The Soviets, for their part, sought to attract German firms
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