Full Title: Russia unveils new fleet of 'invisible' supersonic fighter jets - and boasts that they will be the envy of air forces around the world Russia has unveiled its new fleet of 'invisible' supersonic fighter jets, boasting that they are already the envy of air forces around the world. The £120million Sukhoi-57, which will have a top speed of 1,615 mph, is said to rival America's F-22 and China's Chengdu J-20, Kremlin officials say the fifth-generation stealth jet has been 'christened like a baby after its birth' as Su-57 and will undergo another year of testing before it enters...