Correct me if I'm wrong but I think majority of Ukraine and Belarus people speak russian only as a second language.
So we then we should count ukrainians and belorussians separately.
So we then we should count ukrainians and belorussians separately.
If we're counting this by language, we should figure out how much Ukrainians (or Belorusians) use internet in russian language, primary, and how much don't; and then we should sum up those numbers. Everything else would be a speculation.