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Illegal immigration is a different story - those you see in Calais were really literally struggling for life, and neither Russia nor Belarus are even close. It's just what the article says - economic stagnation.
If you can emigrate legally, for example if you work in high-demand sector such as IT, people emigrate a lot. Lots of Russians working in EU, even in Poland, which has the advantage of being in Schengen but at the same pretty close geographically and culturally.