The current study explores the characteristics of frequently-used multi-word expressions (i.e., lexical bundles) in spoken and written Russian. Lexical bundles are retrieved from a one million word Russian National Corpus (RNC) sample. The lexical bundles in spoken and written sub-corpora of the RNC are analyzed quantitatively regarding discourse functions of reference expressions, stance bundles, and discourse organizers. The analysis confirms that the spoken and written Russian corpora exhibit significantly different lexical bundle distribution patterns: there are more referential expressions in written Russian; while there are more stance bundles in spoken Russian. The study also suggests future study calling more in-depth investigation for developing language-specific discourse functions.