German influence on Soviet rocketry
During World War II, Nazi Germany developed rocket technology that was more advanced than that of the Allies and a race commenced between the Soviet Union and the United States to capture and exploit the technology. Soviet rocket specialists were sent to Germany in 1945 to obtain V-2 rockets and worked with German specialists in Germany and later in the Soviet Union to understand and replicate the rocket technology.
Source: Wikipedia — German influence on Soviet rocketry (CC BY-SA 4.0)