On the Ukrainian language thing, i think the first map might be most useful since it was asking people to declare their first language.
It doesn't matter if someone speaks Russian 24/7 it only matters that they think of themselves as Ukrainian and want Ukraine to remain independent from Russia.
I don't think so. In modern Ukraine, this only mean people are trained to give the "politically correct" answers. Therefore we can see millions of people with Russian names speaking pure Russian but calling themselves "Ukrainians".
Let's see what will they say after the fall of this regime.