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Rhus typhina
Niagara Falls, ON.
Not your fault, it happens, they do have sumacs there, just do not know which ones.
Sorry, Chesterbperry, for some reason the map wouldn't let me enter the correct coordinates. Haha, this definitely wasn't taken in Eastern Europe...!
I think you are correct J, when I looked at the spotting first time it was centered in Eastern Europe. lol
Sorry not familiar with species of that region, and you could very well have different common name.