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Iranian foreign minister says 'mutually respectful' nuclear deal possible by June 30 deadline

  • Iranian Foreign Minister Mohammad Javad Zarif addresses journalists during a news briefing in Athens, Greece, on Thursday, May 28, 2015. Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30. (AP Photo/Yorgos Karahalis)

    Iranian Foreign Minister Mohammad Javad Zarif addresses journalists during a news briefing in Athens, Greece, on Thursday, May 28, 2015. Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30. (AP Photo/Yorgos Karahalis)  (The Associated Press)

  • Iranian Foreign Minister Mohammad Javad Zarif addresses journalists during a news briefing in Athens, Greece, on Thursday, May 28, 2015. Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30. (AP Photo/Yorgos Karahalis)

    Iranian Foreign Minister Mohammad Javad Zarif addresses journalists during a news briefing in Athens, Greece, on Thursday, May 28, 2015. Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30. (AP Photo/Yorgos Karahalis)  (The Associated Press)

  • Iranian Foreign Minister Mohammad Javad Zarif, left, and his Greek counterpart Nikos Kotzias address journalists during a news briefing in Athens, Greece, on Thursday, May 28, 2015. Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30. (AP Photo/Yorgos Karahalis)

    Iranian Foreign Minister Mohammad Javad Zarif, left, and his Greek counterpart Nikos Kotzias address journalists during a news briefing in Athens, Greece, on Thursday, May 28, 2015. Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30. (AP Photo/Yorgos Karahalis)  (The Associated Press)

Iran's foreign minister is holding out hope that a "sustainable, mutually respectful" deal can be struck with world powers in talks over his country's nuclear program before the current deadline of June 30.

Mohammad Javad Zarif says an agreement with negotiators from the U.S., Russia, China, Britain, France and Germany is possible provided "people have their foot in reality, not in illusions."

But he warned that "excessive demands" would make an agreement hard to envisage, even without a deadline. Zarif spoke after talks in Athens Thursday with his Greek peer, Nikos Kotzias

The proposed deal would freeze Iran's nuclear program for a decade, in return for sanctions relief. Iran insists its nuclear program is solely for peaceful purposes, while the West fears it could allow it to build nuclear weapons.