That’s what the Baltics are afraid of. They have up to 40% Russians in their population (I think that’s latvia)
You know why eastern Ukraine is populated by ethnic Russians instead of the Ukrainians who lived there? Because the Ukrainians who weren’t starved in the ‘30s were marched in front of the Soviet Army as human shields and to clear German minefields during Soviet offensives in ‘43 - ‘44. After the war Stalin shipped the remainder to Siberia and transplanted Russians to have loyal proletariats for the eastern Ukrainian mines and factories. Stalin probably did the same in the Baltic states.