Before Crimea annexation percentage of russian friendly and western friendly were almost equal as it seemed by the elections. After that, the russian friendly side had minus two million russian friendly voters
Discussion
For clarification:
There is no valid election with two choices, where the second choice is selected at a rate _nearthe margin of error_. That is statistical nonsense. Absolutely everyone voting would have had to have had the same opinion, because 3% would tend to mark the other box by accident, and that would cover all of the votes for that selection.
This is maths.