I wonder if they have early generation systems, and they are not possible or financially feasible to upgrade.
They have PAC-2, intended for anti ballistic missile work. Israel now has their own higher tech systems for this use case.
There likely are customers for this used system. All of North Koreas neighbors for instance, or Taiwan, facing Chinese IRBMs.
Ukraine’s problem is mainly cruise missiles, which, IIRC, requires different interceptors.
Could Ukraine Get Israel’s Mothballed Patriot Air Defense Batteries [ PAC-2 GEM-T version 1999 versions ]?
As Ukraine sits in dire need of air defenses, Israel will reportedly place all its Patriot systems into storage over the next two months.
https://www.twz.com/land/could-ukraine-get-israels-mothballed-patriot-air-defense-batteries