Aryans left out of Europe and race mixed with muds. Not the other way around.
Europe is the source of white people. Neanderthals had larger brains, fair skin, light eyes, light hair and are native to Europe. The ice age came and drove them out of Northern Europe and they moved like a storm through the lesser mud sapiens, colonizing from Spain to Israel to Western China and ushering in the transition from Neanderthal to the White Race.
When the ice retreated, the 'indo' europeans colonized back into the homelands they left, albeit after significant changes to themselves, and then some time much later the Aryans migrated back out into Persia and India and stayed there and got cucked up.
Aryan is a misnomer to describe Northern Europeans when used in its historical context. Although thanks to Uncle Hitler we're pretty much stuck referring to North Europeans as Aryans now.