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>It was organised by activists living in the concerned territories.

Could be biased then. Even through no fault of their own (i.e. most of the people who heard about the survey, already leaned towards independence and aren't representative of the general population).

>Ural and Ingria residents are the most active. Most of them hold higher education degrees

Now it's more likely to be unrepresentative.

I'm in favour of self-determination and decentralisation. But truth is important.