The Uke air force is over currently. And those F-16s looking to get high and shoot down cruise missiles will be right in the S400 envelope.
Nobody is going to do much in the air there unless it’s the USAF. And even they can’t unless they intend to conduct SEAD inside Russia.
Still flying dude.
S 400 envelope starts from @50 miles from Ukraine. They arent very mobile and subject to counterbattery, so cant get close. Coverage vs maneuvering targets is under 100 miles.
AMRAAM vs cruise missiles should be just fine to cover all the strategic bits of Ukraine without risking SAMs. Heck, even if one reserves the F16’s for deep coverage that lets you concentrate the SAMs further up front.