Precisely. There's no resistance in the air, and Ukrainian air defense is almost non-existent, having suffered lots of damage on day 1. So, there's barely any n

Precisely. There's no resistance in the air, and Ukrainian air defense is almost non-existent, having suffered lots of damage on day 1. So, there's barely any need for fighters. Note also that Russia tends to bring in lots of mobile air defense units to support the air from the ground (unlike US which usually relies more on fighter jets for the same purpose). Then, if the point was to carpet-bomb and annihilate the entire territory, NATO-style, it would have been done already. Destroying singled out targets like munition depots or teletowers doesn't require engaging more than a few jets here and there. It seems like helicopters seem to be heavily relied upon (in providing mobility, recon, convoy support, etc) - but that's a different story.