As I understand it, atomic weapons need a great deal of care and feeding to keep them in prime working order. They aren't something that you can build and then just put on a shelf for storage. However, I'm no expert in this field and I will gladly defer to the opinion of anyone who has more knowlege.
However, if I am correct in my assumptions, then there is a fair question as to just how much of the Russian arsenel is actually useable, with a fair chance that most of it has fallen into disrepair.
As usual you are right on. Which is why the Nuclear Test Ban Treaty was a bad idea.