World

A test of diplomatic process with Iran, and US resolve to leave talks, as nuke deadline nears

  • U.S. Secretary of State John Kerry meets with foreign ministers of Germany, France, China, Britain, Russia and the European Union at a hotel in Vienna, Austria, Tuesday, July 7, 2015. Iran nuclear talks were in danger of busting through their second deadline in a week Tuesday, raising questions about the ability of world powers to cut off all Iranian pathways to a bomb through diplomacy, and testing the resolve of U.S. negotiators to walk away from the negotiation as they've threatened. (Carlos Barria/Pool photo via AP)

    U.S. Secretary of State John Kerry meets with foreign ministers of Germany, France, China, Britain, Russia and the European Union at a hotel in Vienna, Austria, Tuesday, July 7, 2015. Iran nuclear talks were in danger of busting through their second deadline in a week Tuesday, raising questions about the ability of world powers to cut off all Iranian pathways to a bomb through diplomacy, and testing the resolve of U.S. negotiators to walk away from the negotiation as they've threatened. (Carlos Barria/Pool photo via AP)  (The Associated Press)

  • U.S. Secretary of State John Kerry, front, and U.S. Under Secretary for Political Affairs Wendy Sherman meet with foreign ministers of Germany, France, China, Britain, Russia and the European Union at a hotel in Vienna, Austria, Tuesday, July 7, 2015. Iran nuclear talks were in danger of busting through their second deadline in a week Tuesday, raising questions about the ability of world powers to cut off all Iranian pathways to a bomb through diplomacy, and testing the resolve of U.S. negotiators to walk away from the negotiation as they've threatened. (Carlos Barria/Pool photo via AP)

    U.S. Secretary of State John Kerry, front, and U.S. Under Secretary for Political Affairs Wendy Sherman meet with foreign ministers of Germany, France, China, Britain, Russia and the European Union at a hotel in Vienna, Austria, Tuesday, July 7, 2015. Iran nuclear talks were in danger of busting through their second deadline in a week Tuesday, raising questions about the ability of world powers to cut off all Iranian pathways to a bomb through diplomacy, and testing the resolve of U.S. negotiators to walk away from the negotiation as they've threatened. (Carlos Barria/Pool photo via AP)  (The Associated Press)

  • A journalist talks into a TV camera in front of Palais Coburg where closed-door nuclear talks with Iran take place in Vienna, Austria, Tuesday, July 7, 2015. The talks are in danger of busting through their second deadline in a week, raising questions about whether world powers can cut off all Iranian pathways to a bomb through diplomacy — and testing the resolve of U.S. negotiators to walk away from negotiations. (AP Photo/Ronald Zak)

    A journalist talks into a TV camera in front of Palais Coburg where closed-door nuclear talks with Iran take place in Vienna, Austria, Tuesday, July 7, 2015. The talks are in danger of busting through their second deadline in a week, raising questions about whether world powers can cut off all Iranian pathways to a bomb through diplomacy — and testing the resolve of U.S. negotiators to walk away from negotiations. (AP Photo/Ronald Zak)  (The Associated Press)

Iran nuclear talks are in danger of busting through their second deadline in a week, raising questions about whether world powers can cut off all Iranian pathways to a bomb through diplomacy — and testing the resolve of U.S. negotiators to walk away from negotiations.

With a Tuesday target date set for a deal setting a decade of restrictions on Iran's nuclear program, U.S. Secretary of State John Kerry, Iranian Foreign Minister Mohammad Javad Zarif and other top diplomats were huddling in Vienna looking for a breakthrough.

All have spoken of differences remaining, despite 11 days of discussions. And for Kerry and his team, pressure is increasing from skeptical U.S. allies and Congress.

Diplomats had sought agreement by June 30, after missing previous deadlines in July 2014 and last November.