It's actually kind of significant. In past wars, if you committed a war crime, usually the only witnesses were either on your side or a soldier/civilian on the opposing side, who have obvious bias. This made it a lot more realistic to escape consequences. People knew it was happening, but there was often nothing done about it unless it was particularly notable and there was usually a singular officer that the blame landed on.

Now, everyone in wealthier countries has a cell phone with a good camera. Not to mention drones and other video recording devices. Any soldier committing a war crime is much more likely to be caught doing it on camera, and the consequences may follow both him and his family for years. Not to mention it puts that soldier's country in the position of either disavowing his actions and prosecuting him themselves or turning a blind eye and losing face to their citizens and the international community.

Someone like Putin is unlikely to give a shit, of course, but it will probably make the average Russian soldier much more wary of 'following orders' in these cases.