Turret bustle overhang, turret size

Lert: Western MBT's have had enormous turrets with fat ***es that have tons of overhang for quite a while now, while Russian MBT's haven't.   Case in point:   Western:             Russian:         Why does Russia hold on to the bowl turret shape? I guess it's for profile reasons, presenting a smaller target and being easier to hide. And why do western MBT's have those enormously fat heads with all the overhang? I'm guessing it's for ease-of-use with all the ammunition nearby. Which raises all sorts of safety questions, but blow-off panels take care of most of those I suppose.