Language
Language is a system that consists of the development, acquisition, maintenance and use of complex systems of communication, particularly the human ability to do so; and a language is any specific example of such a system.
Literature
Literature, most generically, is any body of written works. More restrictively, literature writing is considered to be an art form, or any single writing deemed to have artistic or intellectual value, often due to deploying language in ways that differ from ordinary usage.
Russian
Russian refers to anything related to Russia, including:
Language
Well languag'd Danyel.
William Browne, Britannia's Pastorals, Book II. Song 2, line 303.
Literature
Be less concerned about the number of books you read, and more about the good use you make of them. The best of books is the Bible.
Christian Scriver, p. 386.
Language
The limits of my language mean the limits of my world.
Ludwig Wittgenstein Tractatus Logico-Philosophicus (5.6)
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