I would argue that, at least so far, Russia has achieved many important goal in her intervention in Syria.  Most importantly, the Russian intervention in Syria forced the USA to agree to a conference in which all the regional actors, including Iran, would be invited.  At the end of its proceedings the conference adopted a joint statement which is fully reposted here: 
I believe that this statement represents a major diplomatic defeat for the USA and yet another Russian diplomatic victory.  Here some points which have been agreed upon (with relevant section of the declaration indicated in brackets):