Here is a nice little visual history of the changing borders of Europe over the years:
I always loved maps, and this is the sort of think that strikes my fancy. Granted you could possibly quibble over this or that, but the broader point remains. Things have changed a bit over the years.
The main reason it's being passed around is to rub Russia's nose in its state of affairs ages ago when Poland and other regions were quite established. Fair enough.
But notice something else. Note the Mongols, then the Ottomans. Swing west to the Iberian Peninsula in the early years. We forget - purposely or otherwise - that the first centuries of European history saw Europe with its back against the wall, fending off one invasion after another.
Even when the early colonies in America were being established in the 17th Century, the Ottomans remained in south central Europe, chomping at the bit for a chance to break through and subdue that land mass Muslims have been eyeing for centuries.
By the 18th Century the scales tipped and Europe emerged as the clear dominant force in the world. Europe would soon gobble up much of the globe over the next century or two. The question is, did those other regions suddenly see the light and decide how wrong it was that their ancestors spent so much time trying to break across the European borders? Or was the last couple centuries merely a temporary setback? I'm sure generations of Europeans and Americans not yet born hope we get the right answer to those questions.