"The Soviet Union was an ethnically diverse country, with more than 100 distinct ethnic groups."[0] This was from 1960's the world is more blended now. What is something you think would make people think 'Russian' versus any other?
Here in Argentina until this year we called "Russian" everyone form the former Soviet Union. Now I try to memorize the correct nationality of each immigrant, but I can't identify the country they are from. Can you distinguish Argentineans from Brazilians?
[0] https://rarehistoricalphotos.com/sketches-soviet-police-ethn...