Herod,
You wrote: "recceguy and A Van. References please to the non-citizenship of Russians resident in the Baltic States"
If you have problems with using search engines, here you are please (the first URL popped out after typing your words in Google):
https://en.wikipedia.org/wiki/Non-citizens_(Latvia)
Let me draw your attention to the following excerpt:
"According to the population census, in March 2011, there were 290,660 non-citizens living in Latvia or 14.1% of Latvian residents,
[9] down from approximately 715,000 in 1991.
[10] According to the Population Register, in January 2011, 326,735 non-citizens resided in Latvia".
So, the solution to this problem they had chosen was very simple: let's wait until all of them just die or go out. And it works, for 25 years already.
Please also note that sites on such topics in English tend to provide a rather mild point of view.