

It’s just a surface to air missile. 100 is quite a few, but considering how drones are used in this conflict, it’s probably not nearly enough.
They are likely reserved for last resort air defense closer to cities or areas where they really need to push back the Russian air force.
Patriot batteries are a bit on the expensive side, so their use is likely limited. If I am not mistaken, Ukraine did get a few batteries from other NATO countries and not just the US.
That needs to be in the form of a question, right?