I must disagree on a number of matters. As to borders, they are lines drawn on a map, insubstantial concepts until pressed. There is no permanence. After the Cold War we redrew the map of of Eastern Europe as we saw fit. Much blood was spilled and there is still dissatisfaction, check out today's Bosnia if you wish to verify. On the same token the US expanded westward with no regard to the sovereignty of others. Now Russia wants to redraw some maps, and they are willing to do so with force. How are they any more wrong than we have been?
Ukraine is hardly blameless either. Check out what's been happening in Donbas since 2014.
The comparison to Hitler is laughable. Today's Russia supplies Europe with 40% of their natural gas. They are not clawing back from crippling reparations. They have nukes, so there is virtually no limit to the force they can apply. They also have global reach, meaning our presence isn't needed. As we have equal reach. The EU has three times the population of Russia, vast wealth, and top tier military equipment, we are not needed.