It all depends on what the meaning of 'is' is ... or, in this case, 'unconditional'. The Obama administration said it would hold talks with Iran without preconditions. Guess that just meant preconditions on our side, since Iran has made clear its precondition of no negotiations over the future of its nuclear program.
So the United States will join France, Britain, Germany, China and Russia in talks with Iran. Our rationale: we need to make this effort in order to justify sanctions. Since the Bush administration already participated in similar talks, and since Russia has just said no to any sanctions, that excuse is particularly pathetic.
The lack of courage on our part is sickening.