Here's just Estonia: SOVIET REPRESSION AND DEMOGRAPHIC CHANGES IN ESTONIA

Before Soviet occupation:

Population of Estonia: ~1.13 million

Ethnic Estonians: ~1.0 million (~88%)

Ethnic Russians: ~90,000 (~8%)

Soviet repression:

People deported from Estonia: ~50,000

June 1941 mass deportation: ~10,000

March 1949 mass deportation: ~20,000–21,000

Men forcibly mobilized and transported into the USSR in 1941: ~32,000–34,000

People murdered, imprisoned, or deported by the Soviet regime: more than 75,000

Identified victims who were killed or died in imprisonment/forced resettlement and never returned: more than 22,000

By 1989, near the end of Soviet occupation:

Population of Estonia: ~1.57 million

Ethnic Estonians: ~963,000 (61.5%)

Ethnic Russians: ~475,000 (~30%)

Ukrainians: ~48,000

Belarusians: ~28,000

Demographic change:

Ethnic Russian population increased from ~90,000 to ~475,000

Net increase in ethnic Russian population: ~385,000

Estonian share of the population fell from ~88% to 61.5%

Despite nearly 50 years passing, there were slightly fewer ethnic Estonians living in Estonia in 1989 than before Soviet occupation.

This isn't some Russo phobia or anti communism thing. What they have done is fucking awful and anyone who spews some bullshit about NATO expanding and threatening russia can go fuck themselves. Russia represents an existential threat to its neighbors and it has no one to blame for that sentiment besides itself.