Due to the Soviets getting word of the German jet fighters both MiG and Sukhoi were allowed to experiment with mixed-propulsion fighters. The Su-5 featured a 1650 hp Klimov M-107 engine supplemented by a rear 660 lb st VDRK (Soviet term for Air Reaction Engine Compressor). This enabled the Su-5 to reach 493 mph with boost at 14,000 ft and later up to 503 mph for 10 minute duration at the higher 25,000 ft. The aircraft got a new laminar-flow wing and was armed with a 23mm nose cannon plus 2x .50 cal MGs! But it first flew in April 1945 and Germany surrender on May 8th. So the program was in danger. A flight in July 1945 suffered an engine failure that was irrepairable and so Stalin cancelled further development and went on to analyze and produce copies of German Jumo 004 and BMW 003 jet engines as well as experimenting with German rocket engines and pulsejets. That was the end of Soviet WW2 experimentation. Sadly, they could have produced real jets in WW2, but Stalin kept gutting his aviation design bureaus b/c he hated aviation and distrusted aviation intellectuals as enemies of the State!

http://www.aviastar.org/pictures/russia/su-5_1.jpg http://www.aviastar.org/pictures/russia/su-5.jpg