In the referendum on Ukrainian independence in the 90s every single oblast voted for Ukrainian independence, including Crimea. In Donetsk and Luhansk it was over 80% with very high turnout.
The idea that ethnic Russian means pro Russian is propaganda. It’s just not true. Azov may be unpleasant, but they are undeniably pro Ukrainian, were based in and recruited from Russian speaking areas where under 1% of the population spoke Ukrainian. Their web sites used to all be in Russian.
Self determination? I thought people of Crimea and Catalan enjoy the same rights. You seem to be comfortable for dual standard western policies here.