So looking back a bit, focus on air in Russia Ukraine

First move by Russians was knock out Ukraine's static radar positions to decrease Ukraine's early warning system. Cruise missiles and ballistic missiles. (24th)

And also air defense systems like the S300 surface to air missiles.

Also runways and airports to create runways for themselves and destroy some planes that were parked there (some say they weren't as successful in this part).

Second, focus on air assets of Ukraine (bases and air crafts, and remaining air defenses). This hasn't happened.

Russia is mostly using helicopters and gunships. Unguided weapons. They've left space and Ukraine has launched offensives there. R hasn't kept U's planes on the ground.