David Axe writes in Forbes that according to Greek media, Dark Brandon has finalized a deal with Greece to send military surplus to Greece who will send its old stuff to Ukraine. Greece has Tor and S300 systems and ammunition for example.
Biden plans to use the authority of Excess Defense Articles (EDA) to declare items military surplus, assign them a value, and send them off to allies. This authority is capped at $500 million however there is discretion in the value he assigns to the gear.
Axe notes that historically when the the US gives Greece something they (the US) give Turkey something and connects the F16 deal for new planes + upgrade kits to this revelation.
This isn't a cure all but it is definitely something.
source
ED: edited to clarify it is the US that gives aid to Turkey