Associated Press Russia's Su-57 is one of only four operational 5th-generation fighters in the world. The Su-57 can't quite match China's J-20 and the US's F-22 and F-35, however. But it doesnt need to in order to do what the Russias have in mind. Russia's Sukhoi Su-57 is one of only four operational 5th-generation fighters anywhere on the planet, keeping the rare company of China's Chengdu J-20 and America's Lockheed Martin F-22 and F-35. Each of these fighters was developed with different specialties in mind, but share a collective focus on a few specific desig...