Russian is the official language, so wherever you go in Russia, you'll find someone who speaks it.

Russian is the official language, so wherever you go in Russia, you'll find someone who speaks it. English is becoming a requirement in the business world, and younger people especially will often know enough to communicate, but by no means is English universally understood and spoken. In upscale hotels almost the entire staff has a working knowledge of foreign languages (including English).

You will not learn the language in a short time; concentrate on learning some key "courtesy" phrases, and the Cyrillic alphabet (e.g. "ресторан" spells "restaurant") so you have a chance to recognize street names, labels and public signs.

Russia has hundreds of languages and supports most of them, sending linguists to document them and invent (mostly - in 1920-1960) writing systems for them (all Cyrillic, of course) and making them local official languages. The southern border is lined with Turkic, Mongolian, and Tungusic; the northern with Finnic and Samoyed. The southwest corner has a variety of Caucasian languages; the northeast has the few Chukotko-Kamchatkan languages.

The Russian Orthodox religion is one of the oldest branches of Christianity in the world and continues to have a very large following, despite having been repressed during the communist period. The language spoken in Russian Orthodox church services is Old Church Slavonic, which differs considerably from the modern version and Russian itself.