O великий, могучий, правдивый и свободный русский язык!
Тургенев
Russian is what they speak in Russia.
It has the interesting characteristic of being able to convey very complex meanings in short sentences, but to make natural, cheerful or positive statements quite intractable, such as «с удовольствием» to mean "gladly", "with pleasure", or «самый лучший» for "best". Russian grammar is notoriously difficult, so we discuss it on its own page.