Belarus is a landlocked country in Eastern Europe bordered by Russia to the northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest.

Belarusian is the official language of Belarus, along with the Russian language. It is additionally spoken in parts of Russia, Poland and Ukraine by Belarusian minorities in those countries. To some extent, Russian, Rusyn, Ukrainian, and Belarusian are all mutually intelligible.

Belarusian is spoken by about 6.3 million people. Speakers are facing numerous obstacles when trying to arrange Belarusian language education for their children. As of 2016 there are no Belarusian-language universities in the country.

In its 2016 country human rights on Belarus report, the US State Department also stated that there was "discrimination against ... those who sought to use the Belarusian language." "Because the government viewed many proponents of the Belarusian language as political opponents, authorities continued to harass and intimidate academic and cultural groups that sought to promote Belarusian and routinely rejected proposals to widen use of the language," the report said.

Belarus's two official languages are Russian and Belarusian; Russian is the most common language used at home, used by 70% of the population, while Belarusian, the official first language, is spoken at home by 23%. Minorities also speak Polish, Ukrainian and Eastern Yiddish. Belarusian, although not as widely used as Russian, is the mother tongue of 53.2% of the population, whereas Russian is the mother tongue of only 41.5%

Sources:
Wikipedia
https://www.omniglot.com/writing/Belarusian.htm