

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.
HF tools are not designed for the long term, generally. If you need a tool to work at least once, for one job that you are never going to do again, HF is “good enough”.
The rule of thumb is to never buy a tool there that could result in a gruesome death if it fails to protect your life, like jack stands. (Invest in quality safety equipment first if you get something like an angle grinder.)