For us, western, pure Slavs, a lot of typical russians have very strange, asiatic facial traits, but they will always deny this :)
The Rus are from a Scandanavian descent (the first Rus leader was man named Rurik from Scandanavia), mixed with Slavs over time after the formation of the Kievan Rus, making the Rus... well Russians its own ethinicity. Some call them Sami people. Slavs are from Ukraine, Belarus Latvia etc. They are the original Slavs. Russia has myths similiar to both Scandanavia and Slavic myths.
Slavs are a linguistic group - i.e. people with similar languages.
Russians are an ethnicity, i.e. people of one language, culture, "blood" and so on.
Oh, and in English Russian may also mean a Russian citizen. That person, of course, may be of any blood, culture or language.
Russian-Ethnicity and or nationality. Also known as a pleasant, tenacious, and overall awesome people.
Regarding Rus- Ethnological-Linguistic group incorporating Russians, *Ukrainians, and *Belarusians..
*= Amenable for redefinition/change in contextualization or to be discerned as a cultural "subset" of "Russian"...according to Pan-Rus' advocates in essence.
http://en.wikipedia.org/wiki/All-Russian...
Slav- A tentative ambiguous linguistic/language group. Would engender Polish, Serbian, Czech, Slovakian, etc speakers.
russians used to be slavs. thats until t:he mongolians came and ruined it all
I agree with Vasisualiy