俄語, or Russian, is a Slavic language primarily spoken in Russia and several other countries of the former Soviet Union. It is the most widely spoken Slavic language and is known for its rich literary tradition, with famous authors like 托尔斯泰 and 陀思妥耶夫斯基 contributing to its cultural heritage. The language uses the Cyrillic alphabet, which consists of 33 letters. 俄語 is an official language of the United Nations and is spoken by millions of people worldwide. Its grammar is complex, featuring six cases for nouns, which can affect the meaning of sentences significantly.