But closer to my point go through some pictures of Iranians and Russians and tell me you can tell the difference between them and Italians or in the case of Russian any western eastern middle European! You can’t do it!
It can be done if you are familiar with how people from various regions look. It is difficult given how much people move around these days, but people who come from a stable lineage quite obviously look like where they are from, be it: Russian, German, Italian, Brazilian, Argentinian, Nigerian, Congolese, I've even noticed people from a certain part of Canada, not closely related, look similar.