I think decision makers from the Ukrainian military should get into touch with Google before anything is done, since there is a distinct possibility that removing these markers is a bad idea. Even if they are used for real targeting, they can also be used to warn civilians and the respective installations of upcoming strikes or sabotage actions. Besides, if they really need the marks, they will not stop shooting when they disappear, they will instead more likely shell indiscriminately to show their superiors they're fulfilling their objectives.

I don't know if these considerations are relevant but would urge OP to contact someone in Ukraine about it.