The non-metathesis ruthenium-catalyzed C-C bond formation was discussed. The reactions involving heteroatom additions to alkynes and allyl-ruthenium intermediates were elaborated. The oxa-ene reaction of electron-deficient aldehydes and alkenes was found to be catalyzed using cationic ruthenium-salen complex in nitromethane at 50°C. The cross-coupling of vinyl halides with olefins and alkyl Grignard reagents catalyzed by ruthenium complexes was also elaborated.