Foreign Minister Mohammad Javad Zarif, quoted by the official IRNA news agency after meetings with EU foreign policy chief Catherine Ashton, also called for "seriousness and realism," in the next round of nuclear talks in Vienna next month.
After a second day of discussions with Ashton in Istanbul, Zarif said the P5+1 powers of Britain, China, France, Russia, the United States and Germany should avoid "illusions which might be exerted on them by some pressure groups and people outside the negotiations."
Zarif said reaching an agreement was "completely possible" and that the Islamic republic would take part in the talks with "seriousness, accuracy and without any rush."
But he condemned as "brutal obstacles" the sanctions imposed on Iran over its nuclear activities, pledging their removal was "the basis of our work" in seeking a comprehensive deal that would "preserve the rights and dignity of the nation."
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The next round of talks on resolving Western concerns will take place in Vienna on June 16-20, the European Union announced today.
These reportedly include the scope of Iran's enrichment of uranium, which if further purified could be used to trigger a nuclear explosion, and its unfinished Arak research reactor, whose by-product waste could provide an alternative route to an atomic bomb.
The differences during the last round in Vienna prevented a start being made on an early draft agreement.
Negotiators aim to nail down an exceedingly complex and lasting deal limiting Iran's atomic activities in exchange for a lifting of sanctions.