Ukraine fell to the Russian Empire under the reign of Catherine the Great in 1793
The right-bank Ukraine was annexed by Russia in the Second Partition of Poland.

It was Polish–Lithuanian Commonwealth for an age 1569–1795 .

You can see why Poland dislikes Russia as its behaviour in that region is dreadful .

Cossacks ( is “adventurer” or “free man”) are not Russian they were Slavic Orthodox Christian people.

Russia's goal is simply about invading & controling ......