V-1 Flying Bomb (Germany) ➤ Republic-Ford JB-2/LTV-N-2 Loon (USA)

V-1 Flying Bomb (Germany). In service: 1944–1945 (Wiki)

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Republic-Ford JB-2/LTV-N-2 Loon (USA). In service: 1945–1950 (Wiki)

The Republic-Ford JB-2, also known as the KGW and LTV-N-2 Loon, was a United States copy of the German V-1 flying bomb. Developed in 1944, and planned to be used in the United States invasion of Japan (Operation Downfall), the JB-2 was never used in combat. It was the most successful of the United States Army Air Forces Jet Bomb (JB) projects (JB-1 through JB-10) during World War II. Postwar, the JB-2 played a significant role in the development of more advanced surface-to-surface tactical missile systems such as the MGM-1 Matador and later MGM-13 Mace.
— Wikipedia

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