i dont think so for Chechnya hell no, i think its for super powers like America
It's not a matter of how powerful the bomb is, in my opinion, but what platform they use to deliver it. A MOAB being delivered by a B-2 is going to be more effective than a FOAB on any Russian bomber.
If Russia ever wanted to do such a thing to the U.S., it better have a Stealth platform to deliver it, or it would be shot down.
Can the B-2 deliver a MOAB? I have no clue, but I believe these types of bombs are not intended to be used against super powers with highly advanced air defence.