I reckon Aktungbby might have a good lead there.
I do love Russian rocket designs, there's something of a brute elegance to them.
EDIT: Yeah, look at this fairing here:
If you look at the front of it you can see two circular areas, one presumably is a part of the seperation of the clamshell, since there's a hole there on the debris that's found, but just below/above in both pictures is the circle.