What are you talking about? Lithuania has the lowest percentage of Russians (about 5.5) than any of the Baltics. The percentage was more than 9 in 1990. There are more Poles than Russians.
After the world war, Lithuanian partisans for the Russians for more than a decade. That held down the number of Russians staying there.
See #16.
The Eastern part of Lithuania was Polish up to 1939, including Wilno (Vilnius)