Then that would point toward a Ukrainan likely making the Ярун mistake. I suppose they'd be even more prone to not checking the country and assuming it's the one nearby/in their country.
Ukrainians are more prone to be aware there were two cities with similar names than Russians. By way of example, people who live in Washington State know that cities named Vancouver exist in both Canada and Washington and that you do have to be careful which one you pick even though one is much larger and better known. Washington State residents may of course still make the mistake, but they are FAR less likely to do so than someone who grew up in the Eastern US or Mexico who had no direct personal experience or awareness of the duplicate naming prior to clicking on a search result. Russian troops come from all over Russia. Ukrainian troops come from Ukraine. Proximity-based awareness of the potential for confusion will be far higher on average for the Ukrainians.