Nothing political here. I just say that Ukrainians are ethnic Russians. Russians from Moscow are much closer to Poles, while Eastern Russians from Siberia are close to Mongols. This is how Russia was extended to the East:
It was done the same way as America was conquered by Europeans. Russians don't want to speak about this part of their history, but in fact it's the most biggest country on planet Earth and it's so big because Russians were the most warlike nation.