Yakovlev Yak-15 (Feather) Jet-Powered Fighter
The Yakovlev Yak-15 mated the German Junkers Jumo 004B turbojet engine with a highly-modified airframe of the Yak-3 piston-powered fighter.
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After the fall of Germany in May of 1945, the Soviet Union (as well as the Allies) was privy to pieces of captured data regarding turbojet engine technology. The age of the jet would soon be upon the world with all of the victorious world powers benefitting from the work that had been done by the German engineers in the months and years leading up to the end of World War 2. Not only was valuable data captured by the victors but, as in the case of the Soviet Air Force, large stores of engines were netted in abandoned or conquered German-run production facilities. Such technology could then be thoroughly tested and, ultimately, reverse-engineered to garner new insight into the evolving technology of the time. The German Junkers Jumo 004B series turbojet engine became one such spoil of war for the Soviet Union and it was quickly collected in quantity and delivered for review to various Soviet firms.
The Soviet Union, along with the British and the Americans, had persevered to bring about their own indigenous jet engine programs during the war with the British proving ahead of the curve by war's end (next to Germany). As such, Soviet leader Joseph Stalin encouraged the use of the captured German engines to facilitate introduction of new Soviet jet-powered fighters until proven homegrown technology could become available in quantity.