The following is the Jan. 18, 2023, Congressional Research Service In Focus report, PATRIOT Air and Missile Defense System for Ukraine..
From the report:
The PATRIOT air and missile defense (AMD) system is an integral component of U.S. air and missile defense. The system and its interceptors are both expensive and limited in supply. On December 21, 2022, the Department of Defense (DOD) announced the United States would provide a PATRIOT battery to Ukraine as part of a larger $1.85 billion...
https://news.usni.org/2023/01/20/report-to-congress-on-patriot-missiles-for-ukraine