That's an erroneous and unsubstantiated contention.
Just a couple/few years back Ukraine had a free and open election to choose a president and the candidate that wanted closer ties to Russia...and more distance from the EU, won.
The majority of Ukrainians wanted to be in the Russian sphere.
While a majority in the WESTERN part of the country wanted to be part of Europe.
That said, who ever thought "Ukraine" could be just one country besides the Soviets?
Nobody.
I know people who just fled there
So, I got it first hand
Who did you get your information from?