The Su-57 has a supposed ~$35-$45 million unit cost (versus closer to $78m for eg the recent F35A planes [1]). If you adjust that to the US economic output per capita figures, you're looking at up to a quarter of a billion dollars per plane equivalent for the Su-57. A crushing sum, in other words, for the Russians and their economic capabilities.
However, the Russians sold Su-35s to China at a cost of $83 million a few years ago. So the quoted Su-57 numbers certainly appear fraudulent. The real unit cost is probably twice the claims. There is minimal transparency in such things as it pertains to Russia.
So far it appears they can't afford or deliver their supposedly cost effecient plane:
It's very hard to compare sales figures with fly-away costs as they measure completely different things. Sales figures usually include many extras like weapons, simulators, training, support, spare parts, spare engines, integration with other (usually local) weapons, and other custom developments that can massively raise the bill. Conversely fly-away costs tend to exclude everything to look as small as possible: things like radars, helmet mounted displays, sometimes even engines are left aside.
However, the Russians sold Su-35s to China at a cost of $83 million a few years ago. So the quoted Su-57 numbers certainly appear fraudulent. The real unit cost is probably twice the claims. There is minimal transparency in such things as it pertains to Russia.
So far it appears they can't afford or deliver their supposedly cost effecient plane:
https://nationalinterest.org/blog/buzz/russias-stealth-fight...
[1] https://www.defensenews.com/air/2019/10/29/in-newly-inked-de...