Ukraine means U krai, у кая, literally near the border. Prior to 1917 there was no Ukraine, and prior to 1954 Crimea was never part of Ukraine. Long ago, Russian capital was in Kiev, Ukraine. But don't get it twisted, Ukraine was never a country by its own, or had their own separate people. They speak different language, and it is different just like New York accent is different from Philadelphia accent. This is why everybody understands Russian.
During WW2, there was more jews killed in Ukraine, by Ukranians, than in entire Europe.
Babi Yar massacre was conducted by Ukranian militias.
What's wrong with them? Because they live near border they are much more prone to surcome to propaganda. There are two religions at work here, Roman Catholic, that would be Europe, and Moscow Orthodox, that would be Slavic. As you might have guessed, there is a religious war. Any war, is a power struggle. Roman catholic church controls the west, while Moscow Orthodox controls the east, so it is a struggle between west and east. Back in the day maps were smaller, and this is where British made assumptions that Russia would take over British Indian colony, because literally on the map it looked like there was no 2 deserts and countless mountains. British even fought two wars in Afghanistan because of this, and lost both of them. Thus, Ukraine is first to come under attack from outside because it is located near the border.