This is why IMO the request for a route to air superiority from the Ukraine armed forces isn't so far fetched. Eventually they will want to break the stalemate and will need a axis of concentrating power beyond what they have. Same reasoning applies to all the requests for MLRS, self-propelled artillery, and main battle tanks.
I think aircraft are still on the table, but Ukraine wasn't really using their own stuff to the fullest extent possible, so there wasn't really much of a point in sending MiGs and things like that a few weeks ago. There was the potential that they'd just be captured if Kyiv fell.
If Ukraine can pitch the West on the sorties they want to run but can't without additional aircraft, then they'll get it. But right now, the main thing is ground supplies to prevent encirclement.
This is basically the USA saying they will never stop supplying Ukraine with monetary/military aid until Russia folds.
I think this is definitely the position the West overall is taking here. By all accounts, Russia had one of the greatest militaries in the world 2 months ago. And in this moment, every single rocket and drone and rifle you send to Ukraine gets to be used with no reservation against that military, cutting it down tank by tank. There will be projections of Russian military losses based on various durations of the conflict, and cynically, there will be a few projections that involve a longer war but more losses for Russia.
Places like Afghanistan and Syria have been proxy wars between superpowers before, where both sides stoked the conflict to get it going. Here, this is entirely on Russia. They stepped into a proxy war with the West all on their own. And the West is going to send as many military supplies as they can to take a huge chunk out of the Russian military apparatus.