V-2 (Germany) ➤ Hermes B-1 (USA) ➤R-1 (USSR)

V-2 Rocket (Germany). In service 1944–1952. (WIKI)

At the end of the war, a race began between the United States and the USSR to retrieve as many V-2 rockets and staff as possible. Three hundred rail-car loads of V-2s and parts were captured and shipped to the United States and 126 of the principal designers, including Wernher von Braun and Walter Dornberger, were in American hands. Von Braun, his brother Magnus von Braun, and seven others decided to surrender to the United States military (Operation Paperclip) to ensure they were not captured by the advancing Soviets or shot dead by the Nazis to prevent their capture.
— Wikipedia

HERMES B-1 (USA).  1946 ( http://www.astronautix.com/)

R-1  (USSR). 1946 (WIKI)

The USSR also captured a number of V-2s and staff, letting them set up in Germany for a time. The first work contracts were signed in the middle of 1945. In 1946 (as part of Operation Osoaviakhim) they were obliged to move to Kapustin Yar in the USSR, where Gröttrup headed up a group of just under 250 engineers. The first Soviet missile was the R-1, a duplicate of the V-2. Most of the German team was sent home after that project but some remained to do research until as late as 1951. Unknown to the Germans, work immediately began on larger missiles, the R-2 and R-5, based on extension of the V-2 technology
— Wikipedia

Additional readings:Operation Paperclip

AIM-9 Sidewinder (USA) ➤ K-13/R-3 (USSR)

On 28 September 1958,one of the missiles becoming lodged in a MiG-17 without exploding, allowing it to be removed after landing. The Soviets later became aware that the Chinese had at least one Sidewinder, and after some wrangling, were able to convince the Chinese to send them one of the captured missiles. Gennadiy Sokolovskiy, later chief engineer at the Vympel team, said that “the Sidewinder missile was to us a university offering a course in missile construction technology which has upgraded our engineering education and updated our approach to production of future missiles.”

The Sidewinder was quickly reverse engineered as the K-13 (also called R-3 or Object 300) and entered limited service only two years later in 1960
— Wikipedia

AIM-9 Sidewinder air-to-air missile (USA) , 1953 (Wiki)

K-13/R-3 air-to-air missile (USSR), 1960 (Wiki)