Unfortunately it’s not that easy.
They have already got a large sum of F16’s, but it takes training of Ukrainian pilots before they can be used in combat.
From what I understand they should be ready to fly in early 2024. That still a long time to go - but you don’t want to lose pilots or planes because of inexperience with that type of airplane.
This is only counting confirmed dead games. There are still loads of game companies and shot loads of stupid peoples money to be drained.