I think in essence this is principally an American and Russian discussion. Anything else is relevant and important, but when we're talking about this particular issue in a NATO context or a Euro-Atlantic context, these are the two big players. They're the ones that own them.
The United States is very careful to consult carefully with its NATO allies on the deployment of sub-strategic nuclear weapons. NATO has a role to play in setting the policy for NATO-held—let's put it that way—nuclear weapons in Europe, but we're talking about very small numbers.
The real discussion to be had is between the United States and Russia. President Obama very clearly said, when START II was agreed, that his vision for the next step of the discussion was to discuss these issues. The Americans have made their desire to work in that direction very clear. My own view is that it is for Russia to respond and to respond positively. NATO will be 100% in support of these discussions because all the allies agree that this is the logical next step for all the reasons you mentioned.