Ukraine wank in 13th century?

I really like to see a good Ukraine wank...but I really don't see an Ukraine wank such as Galicia-Volhynia conquering Lesser Poland and Hungary in the Late 13th century instead of Wenceslaus II, I know that Lev I of Galicia set eyes on the Duchy of Krakow like Wenceslaus II what if Lev I of Galicia gains the Duchy of Krakow.
 
That scenario has a huge, huge problem - THE MONGOLS

And if you remove the Mongols the world we know quold be urecognisable.
 
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