This is a Ukrainian slource on how Russia changes the demography in Crimea and in the Donbass.
https://uacrisis.org/en/massive-russ...ed-territories
Two weeks ago I linked a result from the Ukrainian census 2001 or 2002, it showed that back then only the Crimean had a real majority of people speaking Russian (58%). Already both in the Donbass and Luhansk regions they had no such majprity anymore. - Well,
twenty years ago.
However, that people speak Ukrainians does not mean they are pro-Russian, also many are bi-lingual, speak both languages. Russia has failed to motivate Russian speaking Ukrainians for revolting against Kyiv and joing the invaders. Most Russian speakers, an overwhelming majoity of them, voluntarily fight against the Russian attackers.
I mean from the language spoken you cannot automatically conclude on the nationality that is preferred.