Well, what do you hear and see in the TV? That would be pretty interesting to hear from a coherent source.
"1) Russia didn't send military forces to Crimea, those armoured guys were Crimean militia"
2) Crimea is rightfully Russian territory since Ukraine fucked up with its government and Crimea have chosen to join us, especially since most of crimeans are russians.
3) Putin is a boss who did nothing but recieved a good portion of land, most Russians welcome and praise the joining of Crimea because it's like returned back to us"
Something like that. I don't watch TV that much though, so it might be a bit outdated.
UPD:
most Russians welcome and praise the joining of Crimea
Hah, this sounded quite overestimating. People here don't seem to care about this whole matter too much, hence why the post rate from Russians in this thread is low as well.