Iran’s foreign minister raised the prospect on Friday of unlimited Iranian atomic fuel enrichment if the final phase of talks with the United States and other big powers on Iran’s disputed nuclear program does not achieve an agreement by a June 30 deadline, with all sanctions dropped.

The foreign minister, Mohammad Javad Zarif, also said the Americans had diverged from a framework agreement reached on April 2 by publishing what they described as a fact sheet about the framework’s basic provisions. Contrary to that assertion, Mr. Zarif said, there would be no phased removal of sanctions to ensure Iranian compliance.