The following is the March 17, 2023 Congressional Research Service report, Transferring Fighter Aircraft to Ukraine: Issues and Options for Congress.
From the report
Since Russia’s renewed invasion of Ukraine began in February 2022, some defense analysts, U.S. defense officials, and Members of Congress have debated whether or not to enable the transfer of U.S. or NATO military aircraft, including fighter jets and unmanned aircraft, to Ukraine. In general, the debate has centered around two broad...
https://news.usni.org/2023/03/21/report-to-congress-on-transferring-fighter-aircraft-to-ukraine