Actually, it's funny that you should mention 2012. I thought it was odd that the Russian number was correct, but the US number wouldn't be accurate until 2012. Turns out the Russian number won't be correct till 2012 either.
"Russia has approximately 7,200 operational nuclear warheads in its active arsenal. This includes about 3,800 strategic warheads, a decrease of some 400 from 2004 due to the withdrawal of approximately 60 ballistic missiles from operational service. Our estimate of operational non-strategic nuclear weapons remains unchanged from last year at 3,400."
from
http://www.thebulletin.org/article_nn.php?art_ofn=ma05norris
And here's a quote by people a lot more knowlegable than you or I. Although, I guess since it backs up what I'm saying, just you really.
"The threat of a ballistic missile attack on the United States is evolving. Although Russia's arsenal is shrinking, the United States remains vulnerable to a large Russian attack with ICBM and submarine-launched ballistic missile (SLBM) strikes, employing multiple independent re-entry vehicles (MIRVS) and decoys. Meanwhile, China has a small, but growing, ICBM force capable of reaching the United States."
http://www.foreignpolicy.com/story/cms.php?story_id=1695
It's over! If we attacked them, they would destroy us. MAD.