Peter Kenyon

Iran and six world powers are meeting in Vienna this week in their latest attempt to hammer out a comprehensive nuclear agreement by July 20.

That's when a six-month interim agreement expires. It can be extended for up to another six months, though all sides say they're aiming for an agreement this summer.

Iran is negotiating with the so-called P5 plus one, which consists of the five permanent members of the U.N. Security Council — the U.S., Britain, France, Russia and China — plus Germany.

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And I'm Melissa Block. The battle for control of eastern Ukraine heated up again today. Pro-Russian insurgents shot down a military helicopter - killing at least a dozen soldiers, including an Army general. The deaths came days after the Ukrainian military inflicted heavy losses on rebels, who had seized the Donetsk airport.

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