Kerry cautiously hopeful before Iran nuclear talks

By Arshad Mohammed and David Brunnstrom WASHINGTON (Reuters) - U.S. Secretary of State John Kerry said on Thursday he was hopeful about nuclear negotiations with Iran but that he did not wish to convey optimism ahead of a June 30 deadline for a deal. Yes, I am hopeful, but I am not conferring optimism," Kerry told reporters in response to a question after presenting an annual U.S. report on human rights. Kerry flies to Vienna on Friday to join negotiators from six powers and Iran seeking an agre