United Aircraft Corporation
The Su-57 could be the future of Russian military aviation - but there's still a lot of questions hanging around the country's first stealth fighter.
While Russia recently announced its desire to turn its first stealth fighter into a sixth generation plane, the Su-57 is still undergoing testing and has yet to be mass produced.
Moscow, nevertheless, touts the Su-57 as a more capable fighter than the F-22 Raptor, despite the fact that much of its capabilities are still classified.
While the two stealth planes are similar in design and other ways, they also have plenty of differences.
Here's what we know thus far about the Su-57: