Iran: More Concerns

So I just read somewhere that Russia--and possibly also China?--may be helping Iran target U.S. assets--including bases and carriers.

Now, I'm nothing like an expert here...but...:

Imagine that Iran manages to get a lucky hit and badly damage a carrier--or even sink it--on the basis of Russian (or Chinese) assistance.

Then wouldn't the WWIII chatter become...more than mere chatter?

OTOH I've also read that the Iranian regime is basically an apocalyptic sect...is that true? How can I possibly know so little about this? If it is true...then...seems obvious that we can't let them get nukes. And probably shouldn't have let them get as strong as they are...

What confusing mess.

To me, anyway.