Eight more Patriot batteries and the Kinzahl & Iskander shoot down rate will climb dramatically.
One or two of these batteries need to be colocated with the F-16s.
These are an earlier version?
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Yes, but they may be upgraded before arrival in UKR.
I am certain that these systems have been upgraded and well maintained.
The GEM+ missiles are highly capable against tactical ballistic missiles and cruise missiles.
The missiles are still in production with a contracted backlog of approximately 1,500 missiles and a near-term demand of an additional 1,000 missiles.
I do not know what Israel is replacing them with.
Below is a Wikipedia link with additional information on all Patriot configurations.