Ukraine is asking for the A-10. Memelords from reddit seem to vehemently hate the A-10, but I think the A-10 could be a decent bomb truck and the fact it can land on improvised runways as well as the lower training turn around for pilot/maintenance training than most modern airplanes makes it a net positive. It helps that the Air Force is finally planning to retire the things.
I've posted ad-infinitium about A-10 being the wrong platform for Ukraine, unless Ukraine is somehow able to gain air-parity with Russia or Russia removes (or has removed) any SAMs more advanced than the SA-2.
For a modern jet, and I emphasize we're grading on a scale here, so again
For a modern jet its slow, its clumsy, and its main strengths - the ability to loiter over a target and the ability to soak hits from anti-air guns - doesn't matter in the current combat environment.
(Now if you could shut down the Russian airforce for a few hours, turning some A-10s loose on the russian fortifications would really do a number.)
The only real thing the A-10 would give Ukraine would native NATO weapon integrations, but even then the avionics on the A-10 are older and there a tons of better craft; i.e. Mirage 3000s would give Ukraine NATO-bombs on a platform that is 3-4x the speed and much better maneuverability.
In the immediate/short term, they'd be much better served by the Grippen than any current US aircraft. In the long term if it comes to that, Ukraine would be fine with the F-16 since as discussed, once Ukrainian pilots start getting trained it is more than capable of Wild Weasel operation.
Basically the A-10 is what you give Ukraine at
end of the SMO to smash the last dug in hold outs, not now while the Russian airforce still has missles.