Are Eastern Europeans/Slavs Eurasians or have Asian genes in them?

[DukeofSerbia]

Yes, it is. That's why I chose this username. I didn't say that Iranian/sarmatian theory isn't true, just that it isn't proven. We can not say with certainty that this theory is true. It is one of many theories. There is a theory that all slavs called themselves serbs, for example. Sarmatian/iranian theory tries to explain the name "serbs", not people. France got it's name after the german tribe, franks, but today we do not consider french to have germanic origin.

Iranian theory has some weaknesses. Many Croatian historians claim that they came from Iran.