Demosthenes looked northern European, because of his mother, who had sarmatian roots.

Sounds strange that iranic speaking people were northern looking..

I doubt Sarmatians were northern looking in a sense we perceive northerners today.  They were a union of Iranic speaking tribes who were nomads.

The documentary presents an overview of the history of Sarmatians showing Sarmatian treasures from Azov Museum. Azov museum holds the largest collection of  Sarmatian archeological findings which it loans to many museums around Europe for exhibitions. IMO the documentary is worth to watch even it's not in English.