This is correct
It is better to be stateless citizen than Estonian or Russian.
It gives privileges in both countries.
Double citizenship are not allowed in Estonia.
Re:Estonia is a place for independent minds
by dullgiulio on Tuesday April 16, 2019 @03:25PM
(#19676512)
Double citizenships are actually allowed in some cases (dual citizenship from birth, honorary bestowment, etc.)
Many grey passport holders are also offered Russian citizenship (with which they could still legally live in Estonia), but they refuse it.
This citizenship topic is not as black and white as one usually reads.
There is a procedure to obtain full citizenship, which includes a basic test of Estonian language. If you lived all your life in Estonia, the test should be pretty easy. Personally, I would wave it in many cases.
Many EU countries have much more difficult procedures to gain citizenship.