0% people voted for Taliban in Afghanistan (as no Taliban politician was allowed to participate in elections) yet they clearly enjoyed support of majority of population.
Exile happened in 2014, due to closeness to Yanukovitch, for a portion of politicians. That was rather voluntary for them, mainly related to their stance on Crimea and so on. New “pro-Russian” figures came on the scene.
There are still pro—Russian political parties in parliament , which have media support (they are backed by powerful oligarchs) The richest man of Ukraine was the backer of Yanukovich, he hasn’t lost his influence or assets.
There is still internet, for example those blocked channels are very active on Youtube.
There is plenty of data that show suppport for those parties through out the years and it is pretty consistent with what I say - since 2014 it is around 10 - 15 % due to a number of reasons.
On the ground situation is very different than on RT or alike.