Earlier quoted context omitted.
Russian-speaking*. An interesting 2014 read on their inclusion re: national defence matters: https://icds.ee/wp-content/uploads/2014/Juhan_Kivirahk_-_Int...
They use the term ethnic Russian-speaking minorities , but from those minorities, it's ~89% Russians, ~8% Ukrainians and ~3% Belarusians. Not sure how much Pro-Russia sentiment there is among Ukrainians in Estonia but I'd be surprised if it's significant, so it's really "Russians" in 2023, even if it was broadly "Russian-speaking" in 2014.
While only roughly 300,000 to 450,000 of 1.3 million of Estonians have ethnic ties to Russia, 73% are near Estonia’s border with Russia:
https://www.globalsecurity.org/military/world/europe/et-peop...
This YouTube provides an animated history of Estonian borders: