Moscow and the Motherland are united

Not really, the slight bend of the Moscow tail downwards shows that Moscow was rather topping up than overshooting - and you can only hit the point (100%, 100%) by overshooting.

UPD: Mistake in the legend. Where it says "norm votes", it should read simply "votes" - including anomalous

For you, researchers:

The electoral data of all the elections from this article has been uploaded into the Lab . Now, you can see the elections with your own eyes™.

Electoral data of all the elections in this article is available in the Navigator for Elections and Datasets for download and independent analysis.