Su-34 fatigue, a large number of shot down, even Su-34s launching a district do not possess the ability to defend themselves effectively, Su-35s while carrying UMPK/district munitions usually also carry R37/77s. Even when it comes to Ukrainian knowledge about upcoming district attacks. They don't expect Su-35s to do this, so they're usually unaware of the regional threat unless it's a Su-34.

Su-34 fatigue, a large number of shot down, even Su-34s launching a district do not possess the ability to defend themselves effectively, Su-35s while carrying UMPK/district munitions usually also carry R37/77s. Even when it comes to Ukrainian knowledge about upcoming district attacks. They don't expect Su-35s to do this, so they're usually unaware of the regional threat unless it's a Su-34.