Korolev used parts of these proposals for the Soviet developments R-2, R-5 and R-14. In early 1954, the CIA summarized the German concept studies, and Soviet interest therein, based on reports by returned German scientists, among them Fritz Karl Preikschat and Helmut Gröttrup. There was evidence that the Soviets, because of their "love of rocket technology" and "their respect of German work", could well be the first to have long-range missiles. For political reasons, however, the German impact on the Soviet rocketry and space program has long been underestimated.