[Tuna-Fish]

Depends on how good their equipment was. The small boosted plutonium warheads used in that kind of missiles are extremely clean (they are meant to be used over their own territory, after all...), and I think that after the kind of wide dispersion you get when the surface of the object ablates away as it falls there might not be much more than a small blib over the background left.

However, based on my very limited knowledge, I think that the Russians are supposed to only have operational Gazelles in a ring protecting Moscow, and those shouldn't have the range to hit anywhere near Chelyabinsk.