Are you going to lecture me as you sit there combining phrases you don't even understand? You actually said "PIE Aryan". You literally combined two different groups of people, living in two different times, together!
First things first.
Distribution of the R1a haplogroup:
Let me see... You said Ukraine, Russia, all the way up to Poland. Yea.... care to retract your statement now?
Also, you forget (conveniently) to state something (or you probably don't even know). ALL Europeans are descendants of the PIE people, even those that don't have admixture in their ancestral DNA due to the PIE migrations. How? Before the PIE people left to inhabit the Pontic-Caspian Steppes, where did they originate from?
Oh yea! Other European populations!
Who said they are? I'm a fool, and you are functionally illiterate. I said "related", not "you guys speak the same language". How did mix up these two phrases?
The genetic distance between Vietnamese and Chinese populations is very close indeed. And you say it's because East Asians are more homogeneous compared to us "mixed" Europeans.
1: "Mixed" implies admixture from foreign populations. The genetic distance between groups has nothing to do with foreign admixture, which is an indication of your ignorance on the topic. Basic stuff.
2: Vietnamese are usually thrown into the Southeast Asian population group, due to different phenotypic characteristics
(Sundadont vs. Sinodont) and due to being one cluster of people when compared to other regional variations (East Asians, Central Asians, South Asians, etc.)
3: Europeans are remarkably homogenous.
The conclusion is that you share a lot of admixture with other population groups/races, while Europeans are a remarkably homogeneous people, even if there is some strong genetic distance between certain groups (Saami, Iceland, Sardinia, Basques).