How is that a gray zone?
As I understand the gray zone is a place where no Ukrainian or Russian troops are present. Which is a stupid concept for what makes them "present"? Do they have to constantly stand, sit, or lay on it otherwise it doesn't count? Why not just paint that hole pink and purple areas grey??? It's impossible them to be everywhere, cover every square cm all the time. Those aren't occupied, no?!
It's like at the start of this crap, when they draw those worms along the roads.
Imagine WWI generals hunching over the maps how meaningless for them would have been this concept. When French generals evaluated German advances and knew for a fact that there's a patch of field that is not actually occupied they just wrote that down as lost territory. And that's it, it was in German hands from there, and had to be retaken.
This grayzone wankery is literally just to alter the vision, the perspective for clueless outside spectators.