I think the issue with air defenses in Ukraine is actually mainly the Soviet designed S-200, S-300 etc. systems which are quite lethal to aircraft unless suppressed. The Russians have the more sophisticated S-400 and the Pantsir. All of these are pretty effective and this means that the whole battlefield above Ukraine and the contested areas is very dangerous for any kind of aircraft, with the possible exception of stealth types.
I don't think Patriot etc. will really make that much difference, though the Norwegian NASAMS and the Italian Aspide may help a good bit.