From what I have read, Ukraine can still use HIMARS, but will need to develop their own targeting information.
See below-
https://x.com/John_A_Ridge/status/1897344452974514666
https://x.com/yarotrof/status/1897346414960861462
See below-
https://x.com/John_A_Ridge/status/1897344452974514666
https://x.com/yarotrof/status/1897346414960861462
