The United States says "We're complying. We're following the disarmament obligation. Look at the quantitative reductions that are taking place." But, since '96, there really hasn't been progress on specific commitments that have been made. Perhaps most disturbing is this: that the United States and France in particular, since 1996, have expanded the range of circumstances under which they might use - they say they might use - nuclear weapons.
The commitment to international agreements is embodied, it's found in the U.S. Constitution. Article Six of the U.S. Constitution provides that treaties of the United States are part of the supreme law of the land along with the constitution itself and laws passed by Congress. Well, the US government certainly has not been acting in recent years as if treaties were part of the supreme law of the land.
It doesn't seem to be that huge a commitment that would create, you know, some kind of really powerful constituency. But the history has been for the United States and Russia especially that nuclear weapons have kind of become part of the identity of the countries.