The best way for neigbour countries (everywhere) is to switch to democracy and let their citizens decide themselves how to live similar to Brexit or referendum in Scotland.
Yes, and what they have chosen - in Estonia for example - is to still claim to be 'Russian' but not actually live in Russia; this is because even such 'true patriots' realise their lives are better and freer not being inside the borders of the country they claim first allegiance to. This then leaves Estonia with a bunch of malcontents not properly learning the language, and then complaining when they are discriminated against when looking for jobs.