This is my main takeaway from this data:
https://i.imgur.com/xPKU4P7.png
from this PCA I removed the regions which seemed to be outlying because of a low sample number.
Northern(Polesye) and Eastern Ukraine are very homogenous, and probably identical to proto-Slavs.
Southwestern Ukraine is pulled towards a
mix of Hungarians and Romanians best represented by the Hungarian-Transylvania average.
It seems this admixture isn't just limited to the border areas, it spreads much deeper into the country than I thought.
Data is missing from the area between Moldova and Dnipropetrovsk.