Barack Obama actually said...

Unless the United States and Russia provide strong leadership in this area, the coming surge in demand for nuclear power will lead more and ...

An offer to scrap our missile defense plans just because the Russians offer 'help' does not seem like such a good deal.

The national security of both Russia and the United States will suffer if the world experiences a breakdown of the nonproliferation regime.

I'm skeptical of quid pro quo deals of this kind. Successful diplomacy rarely involves trades of completely unrelated issues.