That's dark, considering the history.

The Polish-Lithuanian commonwealth traditionally included western Ukraine with Lviv being a center of both Polish and Ukrainian identity for centuries and a major source of violence between the World Wars. But it was the Polish who ruled and the Ukrainians who were serfs. And when the Russians displaced the Polish nobility it led to a long period of violence.

It's good to see Poland and Ukraine finally getting along. The peoples had a frenemy thing going on for a long time. But it would have been quite toxic if they were a couple until recently.