Someone's been barking up the wrong tree?
Probably. Greece has been in an arms race with Turkey since the 70s and kept it up despite the near financial meltdown of the country. From their POV, the only way any significant equipment (tanks, jets, IFVs or arty) could be donated to Ukraine is if Greece gets given (i.e. donated) something in return that leaves Greece either better off or at the very least, not worse off. Like the deal to send old Soviet BMP-1s to Ukraine in exchange for receiving German Marders.