For basic conversation, anyone learning Russian as a foreign language should primarily work on pronunciation, vocabulary needed in everyday use, and conversational grammar.

In order to do business with Russian partners, all of the above should be combined with more profound study of general business vocabulary and vocabulary specific to your field of work.

Learning Russian as a foreign language for proficiency or academic purposes includes comprehensive study of pronunciation, vocabulary, and grammar, as well as working on listening, speaking, reading, and writing skills.

Source: learnrussian.rt.com

Russian for foreigners