Where is is the official language?
Russia
are there other countries that also use it?
Yes
What are they?
Belarus, Kazakhstan, Kyrgyzstan
Are there countries where its unofficial?
Yes
What ones?
Ukraine
What type of language is it?
East Slavic
What family does it belong?
Indo-European
How many members are living?
three
When were the written hand seen?
from the 10th century onwards
Are there different phonemes?
Yes