Free & Independent reports:
Col. Sam Gardiner notes, in an interview with Amy Goodman on Democracy Now, Russia has deployed tactical nuclear weapons to South Ossetia. The SS-21 Missile launchers are relatively weak compared to bombs that have already been used against Georgia by the Russian air force. However, this move does indicate Russia is potentially upping the game from a conventional weapons war to a tactical nuclear weapons war. Gardiner notes that at a news conference on Sunday, the US Deputy National Security advisor has noted these weapons arriving in South Ossetia.
Business Wire confirms the subject matter of the news briefing in Beijing. Link
La Russophobe 
Ahem, SS-21 is “just” a tactical ballistic missile. It may have various warheads, including conventional ones of course.
Btw, they attacked Grozny with SS-21s in 1999:
http://en.wikipedia.org/wiki/Grozny_ballistic_missile_attack
Iraq-infamous SCUDs were also used to bomb Chechnya, including as late as in 2001.
I doubt Russia will risk nuclear war by doing this. I also doubt they are positioning nuclear weapons inside of Ossetia, this seems to be fear mongering more than anything.
LA RUSSOPHOBE RESPONDS:But if somebody’d told you Khruschev was going to take off his shoe, or Russians were going to elect a proud KGB spy, or Litvinenko was going to get whacked with nukes in London, you’d have said that would be pretty unlikely too, no? Are you suggesting the risk Russia is running in Georgia is rational? We think not.
I think these are not nukes. These are what they used to nail whatsisname, Dudayev? in Chechnya. (Assassinating a guy with a ballistic missile is just their speed, dontcha think? Shows how good their snipers, smart bombs, etc., must be.)
If they had nukes, that would mean they expected to a) be getting their asses kicked in Georgia by b) a force large enough to target with a nuke.
No? Hey, look, you would have to look hard to find a bigger russophobe than I; but I just think they are not nukes. I could be wrong.