From a Ukrainian website:
Between 2022 and 2024, Ukraine received 24 full air defense batteries from Europe and the U.S. However, 18 promised batteries remain undelivered, including 10 from the U.S. — 2 Patriot systems and 8 NASAMS
In June, Ukraine received Russia-launched 5,000 Shahed-type drones
(includes smaller Gerbera and Parodiya types). The highest number in one night was 728.
This is far too many to handle for systems like US Patriot
air defense missiles Trump promised to supply Ukraine.
The US total production capacity is only around 650 Patriot missiles per year. These
missiles cost $3.3 million tax dollars each – roughly 100 times as much as a Shahed.