Iran nuclear talks miss deadline; Russia says 'key aspects' agreed

Lausanne, Switzerland: Six world powers and Iran missed a Tuesday deadline to reach an outline accord reining in Tehran's nuclear program, extending talks into an extra day as they edged toward a deal but failed to agree crucial details such as the lifting of U.N. sanctions.

The negotiators ended talks in the Swiss city of Lausanne in the early hours of Wednesday and said they would reconvene later in the day, with Iran and Russia expressing optimism that an initial agreement was within reach.