>>64429695
I'm going to guess that this is some pressured repayment for aid because this does not seem to be what Ukraine needs either in this war or for post-war defense.
A small/poor country spending its very limited military budget on high-tech fighters is exactly what any larger invader would want. Even completely unopposed the amount of ordinance they can haul to a target is dwarfed by a few artillery pieces. If the enemy is willing to take a few losses they can literally just ignore 1 jet per 10 KM of front.
Since air defense is cheaper than jets, the need to conduct SEAD puts their enemy ahead.
Jets require an expensive and fragile supply chain to maintain any sort of capability. Note that nobody says, "In a zombie apocalypse the weapon I'd want most is a F-14 Tomcat." While flying at Mach 2.3 while salvo-firing 6 Phoenix might be fun, you're going to run into a slight issue after a few minutes when your fuel runs out and you need to land, rearm, refuel, and perform maintenance.
Jets need a massive defense in your rear area to protect a hugely expensive, delicate investment with minimal effectiveness. All of your eggs are in one basket and the eggs aren't even very good unless you have overwhelming superiority and can use them to dunk on your opponent. Your enemy can just human wave their way across your country and take selfies next to the captured aircraft if you haven't spent enough on a ground army to stop them.
This is 150 jets at the expense of tens of billions of dollars of something else.