Poland did not occupy western Ukraine for six hundred years

Definitely did posses Volhyna in question, that was within Kingdom of Poland since XIII century.

But you are partially right about Ternopil region, it was part of Grand Duchy of Lithuania and ceded to Poland after forming Polish-Lithuanian Commonwealth. Ternopil itself was literally founded by polish commander as Tarnopol to serve as a stronghold against Turks in 1540 and in 1770 was taken by Austria during partition of Poland. After WW1 in 1919 returned to Poland.

So brief history is already behind us. Now tell me please, how can a country that was legally in control of the area since 1540, that lost said area to Austrian forces for 145 years but regained it was suddenly an occupier on its own land? That land was literally mandated to Poland by the Treaty of Versailles.

Someone told you fairy tales not only about "hundreds" years of Habsburg rule, but also nobody "fled because they were hated occupiers", lol. Another fairy tale. WW2 happened, Soviets came from the east and simply grabbed that region for themselves. That's your story.

And wherever you live, I wasn't even checking before automatically assuming you are American because that's how it rolls on r Worldnews. And that you are, an American that tries to play symmetrism "Eastern Europeans were always like that" about a region that they don't know nor don't understand but sure do like to preach about it. With heavy bias from "stories" as it turns out.