ONE OF A KIND Russian Air Force Su 47 Berkut fighter jet to challenge US Air force F 22 videos This was the first Russian air force prototype to challenge the us air force F-22 Raptor The Sukhoi Su-47 Berkut (Russian: Су-47 Беркут—Golden Eagle) (NATO .\rbr\rbr\rbr\rbrThis was the first Russian air force prototype to challenge the us air force F-22 Raptor The Sukhoi Su-47 Berkut (Russian: Су-47 Беркут—Golden Eagle) (NATO .