Russia's MiG-31's

Can anyone update me on the MiG-31 fleet as it stands right now?

How many MiG-31’s, MiG-31B’s, and MiG-31BS’s are in service?

Any progress (or better yet recent photos) on the MiG-31BM program?

I’m especially interested in the BM. I want to know just what all munitions it will be cleared for.

I know we have a ton of folks obsessed with Ruskie stuff so please share your wealth. Searching the net didn’t bring me stuff I didn’t already know about the BM, so if someone could be specific on where various muntions can be fitted I’d greatly appreciate it.

Thanks.