As in it provides (extremely weak) pretext for invasion? It is same as Armenia which is also in defensive treaty with Russia and governments of those regions are dependent on Russia so likelihood of them getting adventurous by themself is low. It is hard to imagine Ukrainian forces leaving Donbas without a fight so we are speaking about actual invasion here, with shooting and a lot of dead bodies. If that happens it will happen because someone wanted it to happen, not because of technical pretext.
As in it provides (extremely weak) pretext for invasion? It is same as Armenia which is also in defensive treaty with Russia and governments of those regions are dependent on Russia so likelihood of them getting adventurous by themself is low. It is hard to imagine Ukrainian forces leaving Donbas without a fight so we are speaking about actual invasion here, with shooting and a lot of dead bodies. If that happens it will happen because someone wanted it to happen, not because of technical pretext.