The latest Russian Sukhoi Su-35 fighter gave a very impressive air display at the recent Paris air show. Here's the whole 10-minute flight, captured by an electro-optical infrared camera operated by Flight International. There are a few technical glitches during the footage, but if you wait a few seconds, they clear up. I recommend watching it in full-screen mode.
It's interesting to note how brightly the hot areas of the engines show up on the infra-red display. This demonstrates how so-called 'IRST' (infra-red search and tracking) devices can detect and track aircraft from as much as several dozen miles away, without needing to rely on radar or other devices that emit radiation, which can be detected and tracked in its turn.
The USA has chosen to design its newest warplane (the F-35) differently from the Su-35, emphasizing technology and stealth over raw engine power and aerodynamic maneuverability. Which approach is correct remains to be seen . . . and may be demonstrated in combat in due course, certainly between 'client states' of the respective powers, but hopefully not between the powers themselves!