The problem with it is that because Ukraine, Ukrainian rebels, and Russia all use mostly visually identical equipment it's like looking for a piece of hay in a haystack, if you do manage to find some you have no way of knowing if it's the hay you're looking for.
Except it's not. As has already been stated, which you ignored, the tanks present are a visually distinctive t-72 variant which is only used by Russia - it has confidential armour that they don't want anyone else getting their hands on. The vehicles are also deep in rebel held territory so cannot belong to the Ukrainian forces.