That’s no problem, we call all learn new things every day. You can read about the history of Conrad Henlein (?) and the politics of the annexation to understand the analogy here
This makes your analogy make less sense. No nazi party came to power in the donbass. In fact they precieved that had happened in keiv and seceded.
The analogy is that the invading country came to rescue their ethnic brethren. How does it ‘make less sense’ when it’s correct that they had popular support in the region?
The crisis wasnt started the donbass seceded. The crisis started because there was a coup in keiv. The new government was shelling the donbass long before the invasion. None of that happened in your example.