Russian is the official language of Russia. It is also an official language of Belarus, Kazakhstan, Kyrgyzstan and unofficial but widely spoken in Ukraine and the de facto official language of the unrecognized country of Transnistria and partially recognized countries of South Ossetia and Abkhazia. Russian is one of the six official languages of the United Nations.
We can found written document in Russian from as old as of 10th century BC. This was the period when Slavic people accepted Christianity. The missionaries introduced the language in written form; then it was called Old Church Slavonic and sometimes, Old Bulgarian or Old Slavonic. Further, the void between spoken and written language increased much and the spoken languages changed drastically in terms of sounds and morphology both.
Till the end of 17th Century Old Church Slavonic language continually used as literary language. The reformation of Russian took place in 18th century during the reign of the Peter the Great. The Old Church Slavonic language added with Western elements and Vernaculars etc to fit with the emerging technological scenario.
Russian is most preferred language among people who want to speak different languages of the world or want to be a language professional. In Indian school settings Russian is taught as an Optional subject. Student willing to pursue career in Russian language given choice to study it at college level coupled with other foreign languages like Spanish, Portuguese etc. However, at Post graduate and research level Russian is taught independently.
Languages academies, both government and private and language departments of different universities offers certificate programs in Russian. These programs are most suitable for learners unable to attend regular university class. People having expertise in Russian can work with different government and private agencies as language expert.