Ukraine might be able to keep Russian bombers at bay, except the Russian bombers use long-range glide bombs that they drop out of the range of the Patriots. The Ukrainian fighter jets might be able to do something about that if they had modern air-to-air missiles, but the Americans make them and they don’t want to give them to the Ukrainians, because giving, no, selling at a 10 percent markup over retail, modern American air-to-air missiles to Ukraine is considered by the White House bad foreign policy not in America’s national interest. Seriously, that’s what they say.
Hopefully they get the promised gripens and meteors soon and in sufficient numbers to make a difference.
The additional factor here are long range strike drones that can hit russian airbases at vulnerable periods.
Russia doesn’t have the AWACS aircraft to cover the vast distances.