AI fire at armed or inside an area?

[nnccmm 1]

Hello, I would like to know two things.

First off, how could I make an AI unit fire only if the target is armed? Not necessarily an enemy, just anyone not on their team.

Secondly, how can I set up an area so AI units only fire if you're inside that area? Again, at anyone that isn't on that units team.

Thanks in advance.