I started to wander about the starting stock of Ukraine S-300 missiles.
By the wiki , which pulling data from this article :
The production batch of S-300P was 3000 launcher and 28 000 missile.
Now, there are data that say Ukraine had 300 launchers at 2021, so I think they shoul have around 3000 missiles with these.
Means in the past year if they used up 10 missile /day then they used up the stock.
Issues it all of the missiles that they had 30 years old, and if we consider the self life is 15 years then they are way outdated.
Actually, 3000 missile for 300 launchers means they could refill each empty launchers 1.5 times. And now all missile is on TELs.
Question is the Patriot inventory of the USA.
In 2018 they doubled the production rate to double , to 500 /years.
Means there should be 2000 new patriot, and maybe 5000 from the production run between 1998-2018.
There is talk about to increase the self life to 45 years ( poor man air defense ) , I think to preserve part of cold war invnetory.
So, if we say there was a production run of 3000 between 1988-1998, then should be around 10 000 Patriot missile in worldwide inventory.
Now, we can compare it to the production run of the S-300P between 1985-2012 with 28 000 missiles.
So, I think the current usable patriot stock could be in the rance of 7000 missiles, so dedicating half of the stock to Ukraine would give one more year for its air defense. If they can use it as effectivly as the S-300, but considering the inferiority of PAtriot compared to the Soviet systems the lifetime of that stock could be way less.
And even that would deplete seriously the patriot stock,leaving most likelly only one load for all patriot missile launchers.