The airframe losses of Su-35 and Su-57 are really low. And you have to see that both those aircraft have way higher airframe and engine lifetimes than previous Flanker aircraft.
The main issue is with the close air support. Ka-52, Mi-28, Su-25, and Su-34 losses. They lost a lot of helicopters and these typically require much more maintenance than a fixed wing aircraft.
The main issue is with the close air support. Ka-52, Mi-28, Su-25, and Su-34 losses. They lost a lot of helicopters and these typically require much more maintenance than a fixed wing aircraft.