[propesh]

Pale of Settlements is a good start.

The brutal murders of Jews and Poles occurred during the Khmelnytsky Uprising of 1648–1657 in present-day Ukraine.[22] Modern historians give estimates of the scale of the murders by Khmelnytsky's Cossacks ranging between 40,000 and 100,000 men, women and children,[23][24] or perhaps many more.[25]

[331c8c71]

> has been Russian vs. Ukrainian fighting for nearly a 1000 years (maybe more)?

I'm still waiting for the source suggesting that ukranian and russians has been fighting for nearly 1000 years. That's what you wrote.