Commitments made, Iran and 6 powers face tough nuke talks

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President Obama - Historic Iran Talks

LAUSANNE, Switzerland (AP) -- With one phase of nuclear talks over, Iran and six world powers now have an ambitious to-do list that - if implemented - will cut significantly into Iran's bomb-capable technology while giving Tehran quick access to bank accounts, oil markets and other financial assets blocked by international sanctions.

But the deal is far from done. The sides have been working on a substantive result for nearly two years. After a week of grueling negotiations, they managed on Thursday only to draw up a series of commitments that still must be worked out in detail before June 30. That is the deadline agreed on months before negotiators sat down in Lausanne for the final haggling.

If implemented, the undertakings will substantially pare back some Iranian nuclear assets for a decade and restrict others for an additional five years. It would be the first significant success for the United States and its partners in more than a decade of diplomatic efforts focusing on capping Tehran's nuclear advance.

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US Iran Nuclear Talks -- Congress -- John Kerry -- updated 5/22/2015
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Commitments made, Iran and 6 powers face tough nuke talks
President Barack Obama speaks at Adas Israel Congregation, Friday May 22, 2015, during Jewish American Heritage Month. The president Barack Obama said he has a personal stake in making sure that a nuclear agreement with Iran delivers on its promise. Saying he will not accept a bad deal. He adds: "This deal will have my name on it." (AP Photo/Jacquelyn Martin)
WASHINGTON, DC - APRIL 14: Senate Foreign Relations Committee Chairman Sen. Bob Corker (2nd L) (R-TN) gavels the start of a Senate Foreign Relations Committee markup meeting on the proposed nuclear agreement with Iran April 14, 2015 in Washington, DC. A bipartisan compromise reached by Corker and Sen. Ben Cardin (D-MD) would create a review period that is shorter than originally proposed for a final nuclear deal with Iran and creates compromise language on the removal of sanctions contingent on Iran ceasing support for terrorism. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - APRIL 14: Senate Foreign Relations Committee Chairman Sen. Bob Corker (L) (R-TN) shakes hands with ranking member Sen. Ben Cardin (R) (D-MD) during a committee markup meeting on the proposed nuclear agreement with Iran April 14, 2015 in Washington, DC. A bipartisan compromise reached by Corker and Cardin would create a review period that is shorter than originally proposed for a final nuclear deal with Iran and creates compromise language on the removal of sanctions contingent on Iran ceasing support for terrorism. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - APRIL 14: Sen. Rand Paul (R-KY) (Rear), a Republican presidential candidate, passes Sen. Marco Rubio (bottom), a Republican presidential candidate, as senators make their opening remarks during a markup meeting of the Senate Foreign Relations Committee on the proposed nuclear agreement with Iran April 14, 2015 in Washington, DC. A bipartisan compromise reached by Sen. Bob Corker (R-TN) and Sen. Ben Cardin (D-MD) would create a review period that is shorter than originally proposed for a final nuclear deal with Iran and creates compromise language on the removal of sanctions contingent on Iran ceasing support for terrorism. (Photo by Win McNamee/Getty Images)
The Senate Foreign Relatipons Committee's ranking member Sen. Ben Cardin, D-Md., left, slaps Committee Chairman Sen. Bob Corker, R-Tenn. on the back as they speak to reporters on Capitol Hill in Washington, Tuesday, April 14, 2015, after the committee passed the Iran Nuclear Agreement Review Act of 2015. Republican and Democrats on the Senate Foreign Relations Committee reached a compromise Tuesday on a bill that would give Congress a say on an emerging deal to curb Iran's nuclear program. (AP Photo/Andrew Harnik)
Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn., center, talks with John Barrasso, R-Wyo, left, as they arrive with the committee's ranking member Sen. Ben Cardin, D-Md., right, for a committee business meeting on Capitol Hill in Washington, Tuesday, April 14, 2015, to debate and vote on the Iran Nuclear Agreement Review Act of 2015 on. (AP Photo/Andrew Harnik)
Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn., center, and the committee's ranking member Sen. Ben Cardin, D-Md., right, speak to reporters on Capitol Hill in Washington, Tuesday, April 14, 2015, after the committee passed the Iran Nuclear Agreement Review Act of 2015. Republican and Democrats on the Senate Foreign Relations Committee reached a compromise Tuesday on a bill that would give Congress a say on an emerging deal to curb Iran's nuclear program. (AP Photo/Andrew Harnik)
A protestors listens as right Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn., left, and the committee's ranking member Ben Cardin, D-Md., center, meet with reporters on Capitol Hill in Washington, Tuesday, April 14, 2015, following the committee's vote to approve a bill that would give Congress a say about the emerging deal aimed at preventing Iran from developing nuclear weapons in exchange for sanctions relief. (AP Photo/Manuel Balce Ceneta)
Republican presidential candidate and Senate Foreign Relations Committee member, Sen. Marco Rubio, R-Fla., speaks on Capitol Hill in Washington, Tuesday, April 14, 2015, during a Senate Foreign Relations Committee meeting to debate and vote on the Iran Nuclear Agreement Review Act of 2015. (AP Photo/Manuel Balce Ceneta)
Senate Foreign Relations Committee member Sen. Bob Menendez, D-N.J. listens on Capitol Hill in Washington, Tuesday, April 14, 2015, during debate and vote on the Iran Nuclear Agreement Review Act of 2015. Republican and Democrats on the Senate Foreign Relations Committee reached a compromise Tuesday on a bill that would give Congress a say on an emerging deal to curb Iran's nuclear program. (AP Photo/Andrew Harnik)
Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn., speaks to reporters on Capitol Hill in Washington, Tuesday, April 14, 2015, as he departs a briefing on Iran nuclear negotiation. Republican and Democrats on the Senate Foreign Relations Committee reached a compromise Tuesday on a bill that would give Congress a say on an emerging deal to curb Iran's nuclear program. (AP Photo/Andrew Harnik)
US Secretary of State John Kerry gestures as he speaks to the press at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (AP Photo/Brendan Smialowski, Pool)
Energy Secretary Dr. Ernest Moniz speaks to the media during the daily briefing in the Brady Press Briefing Room of the White House in Washington, Monday, April 6, 2015. President Barack Obama is casting the Iran talks as part of a broader foreign policy doctrine that sees American power as a safeguard that gives him the ability to take calculated risks. (AP Photo/Pablo Martinez Monsivais)
Iranian President Hassan Rouhani speaks in a news briefing at the Saadabad palace in Tehran, Iran, Friday April 3, 2015. Rouhani on Friday pledged that his nation will abide by its commitments in the nuclear agreement reached the previous day in Switzerland. (AP Photo/Ebrahim Noroozi)
WASHINGTON, DC - APRIL 08: Acting U.S. State Department spokesperson Marie Harf conducts a daily press briefing at the State Department April 8, 2015 in Washington, DC. Harf spoke on various topics including the Iran nuclear deal. (Photo by Alex Wong/Getty Images)
US President Barack Obama makes a statement at the White House in Washington, DC, on April 2, 2015 after a deal was reached on Iran's nuclear program. Iran and world powers agreed on the framework of a potentially historic deal aimed at curbing Tehran's nuclear drive after marathon talks in Switzerland. (Photo credit: NICHOLAS KAMM/AFP/Getty Images)
From left Foreign Secretary Philip Hammond speaks to US Secretary of State John Kerry as European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini and Iranian Foreign Minister Javad Zarifat take their positions before making a statement , at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (AP Photo/Brendan Smialowski, Pool)
US Secretary of State John Kerry, left, and Iranian Foreign Minister Javad Zarif arrive to deliver a statement, at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (AP Photo/Brendan Smialowski, Pool)
Iranian Foreign Minister Javad Zarif, right, waits to make a statement flanked by German Foreign Minister Frank Walter Steinmeier, left and European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini, at the Swiss Federal Institute of Technology, or Ecole Polytechnique Federale De Lausanne, in Lausanne, Switzerland, Thursday, April 2, 2015, after Iran nuclear program talks finished with extended sessions. The United States, Iran and five other world powers on Thursday announced an understanding outlining limits on Iran's nuclear program so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. (AP Photo/Brendan Smialowski, Pool)
WASHINGTON, DC - APRIL 02: A teleprompter shows the text for U.S. President Barack Obama's remarks on negotiations with Iran over their nuclear program on April 2, 2015 in Washington, DC. In exchange for Iran's agreement to curb their country's nuclear proliferation, the United States would lift some of the crippling sanctions imposed. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - APRIL 2: U.S. President Barack Obama boards Air Force One after making a statement on Iran nuclear negotiations in the White House April 2, 2015 in Washington, DC. The so-called P5+1 nations reached an agreement for an Iranian nuclear program and a process to lift sanctions against Iran after talks in Switzerland. (Photo by Olivier Douliery-Pool/Getty Images)
US Secretary of State John Kerry (C) walks with bodyguard in the garden of the Beau-Rivage Palace hotel during a break in Iran nuclear talks in Lausanne, Switzerland, on April 1, 2015. Rollercoaster talks aimed at stopping Iran getting a nuclear bomb went into extra time amid cautious signs that after seven days of tough negotiations a framework deal may be near.  (Photo credit: ABRICE COFFRINI/AFP/Getty Images)
US Secretary of State John Kerry (L) gestures while waiting for the opening of a plenary session with P5+1 ministers, European Union and Iranian minister on Iran nuclear talks at the Beau Rivage Palace Hotel in Lausanne, Switzerland, on March 31, 2015. Foreign ministers from major powers kicked off early a final scheduled day of talks aimed at securing the outlines of a potentially historic nuclear deal with Iran by a midnight deadline. (Photo credit: FABRICE COFFRINI/AFP/Getty Images)
LAUSANNE, SWITZERLAND - MARCH 31: P5+1 Ministers, European Union and Iranian officials wait for the opening of a plenary session on Iran nuclear talks at the Beau Rivage Palace Hotel on March 31, 2015. (Photo by Thomas Trutschel/Photothek via Getty Images)
LAUSANNE, SWITZERLAND - MARCH 31: German Foreign Minister Frank-Walter Steinmeier waits for the opening of a plenary session on Iran nuclear talks P5+1 Ministers, European Union and Iranian officials at the Beau Rivage Palace Hotel on March 31, 2015. (Photo by Thomas Trutschel/Photothek via Getty Images)
US Secretary of State John Kerry, centre, sits at the negotiating table with U.S. Under Secretary for Political Affairs Wendy Sherman, left and U.S. Secretary of Energy Ernest Moniz, during a meeting with Iran's Foreign Minister Javad Zarif over Iran's nuclear program, in Lausanne, Switzerland, Thursday, March 19, 2015. (AP Photo/Brian Snyder, Pool)
Iran's Foreign Minister Mohammad Javad Zarif walks into another negotiating meeting with United States Secretary of State John Kerry over Iran's nuclear program in Lausanne, Switzerland Wednesday March 18, 2015. American and Iranian negotiators raced to fill out a framework for rolling back Iran's nuclear program and punitive U.S. economic sanctions, hoping for enough progress to call in other world powers for the finishing touches on an agreement next week. (AP Photo/Brian Snyder, Pool)
In this photo released by an official website of the office of the Iranian Supreme Leader, Iranian Supreme Leader Ayatollah Ali Khamenei delivers speech during a meeting with air force commanders and officers in Tehran, Iran, Sunday, Feb. 8, 2015. Iran's top leader says no deal is better than a bad deal when it comes to negotiations with world powers over the country's disputed nuclear program. (AP Photo/Office of the Iranian Supreme Leader)
WASHINGTON, USA - FEBRUARY 5: Senator Tom Cotton speaks during a news conference with members of the Senate Armed Services Committee about arming Ukraine in the fight against Russia in Washington, D.C. on February 5, 2015. (Photo by Samuel Corum/Anadolu Agency/Getty Images)
WASHINGTON, DC - MARCH 03: Israeli Prime Minister Benjamin Netanyahu (3rd L) poses for photographers with U.S. Senate Majority Leader Sen. Mitch McConnell (R-KY) (2nd L), Senate Minority Leader Sen. Harry Reid (D-NV) (4th L), Senate Majority Whip Sen. John Cornyn (R-TX) (L) and Minority Whip Sen. Richard Durbin (DIL) (R) prior to a meeting at the U.S. Capitol March 3, 2015 in Washington, DC. At the risk of further straining the relationship between Israel and the Obama Administration, Netanyahu addressed a joint meeting of the U.S. Congress warning congressional members against what he considers an ill-advised nuclear deal with Iran. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MARCH 3: Israel's Prime Minister Benjamin Netanyahu speaks before joint session of Congress, on March, 03, 2015 in Washington, DC. (Photo by Bill O'Leary/The Washington Post via Getty Images)
President Barack Obama speaks about Iran and Israeli Prime Minister Benjamin Netanyahu's speech to Congress, Tuesday, March 3, 2015, during a meeting with Defense Secretary Ash Carter in the Oval Office of the White House in Washington. The president said Netanyahu didn't offer any "viable alternatives" to the nuclear negotiations with Iran during his speech to Congress. (AP Photo/Jacquelyn Martin)
US Secretary of State John Kerry (Far R) goes for a stroll with assistant and security on the shore of Lake Geneva upon his arrival on February 22, 2015 in Geneva. Kerry arrived in Geneva for renewed talks with his Iranian counterpart on Tehran's nuclear programme, after warning 'significant gaps' remain as a key deadline approaches. Kerry is set to sit down for two days of talks with Iranian Foreign Minister Mohammad Javad Zarif, whose country denies its nuclear programme has military objectives. (Photo credit: FABRICE COFFRINI/AFP/Getty Images)
US Secretary of State John Kerry (L) arrives at his hotel on February 22, 2015 in Geneva. Kerry arrived in Geneva for renewed talks with his Iranian counterpart on Tehran's nuclear programme, after warning 'significant gaps' remain as a key deadline approaches. Kerry is set to sit down for two days of talks with Iranian Foreign Minister Mohammad Javad Zarif, whose country denies its nuclear programme has military objectives. (Photo credit: FABRICE COFFRINI/AFP/Getty Images)
US Secretary of State John Kerry (R) walks back to his hotel after on February 23, 2015 in Geneva. Washington and Tehran's top diplomats sat down again on February 23 for talks on Iran's nuclear program as they struggled to narrow gaps ahead of a key deadline. (Photo credit: FABRICE COFFRINI/AFP/Getty Images)
US Secretary of State John Kerry (C) goes for a stroll with assistants and security along the shores of Lake Geneva upon his arrival on February 22, 2015 in Geneva. Kerry arrived in Geneva for renewed talks with his Iranian counterpart on Tehran's nuclear programme, after warning 'significant gaps' remain as a key deadline approaches. Kerry is set to sit down for two days of talks with Iranian Foreign Minister Mohammad Javad Zarif, whose country denies its nuclear programme has military objectives. (Photo credit: FABRICE COFFRINI/AFP/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 21: U.S. Secretary of State John Kerry speaks during a media briefing at the U.S. Embassy on February 21, 2015 in London, England. Earlier Kerry met with British Foreign Minister Philip Hammond and it's expected that the issue of the continuing conflict in the Ukraine will dominate talks between the two nations. (Photo by Neil Hall - Pool/Getty Images)
Is the U.S. being too soft on Iran when negotiating on sanctions and a potential nuclear deal? Strategic Policy Consulting's Alireza Jafarzadeh and WSJ's Simon Constable discuss.
U.S. Secretary of State John Kerry, left, shakes hands with Iranian Foreign Minister Mohammad Javad Zarif before a meeting in Geneva, Switzerland Wednesday, Jan. 14, 2015. Zarif said on Wednesday that his meeting with Kerry was important to see if progress could be made in narrowing differences on his country's disputed nuclear program. (AP Photo/Rick Wilking, Pool)
U.S. Secretary of State John Kerry addresses the media after the closed-door nuclear talks with Iran, in Vienna, Austria, Monday, Nov. 24, 2014. Facing still significant differences between the U.S. and Iran, negotiators gave up on last-minute efforts to get a nuclear deal by the Monday deadline and extended their talks for another seven months. The move gives both sides breathing space to work out an agreement but may be badly received by domestic sceptics, since it extends more than a decade of diplomatic efforts to curb Iran's nuclear prowess. (AP Photo/Ronald Zak)
U.S. Secretary of State John Kerry, left, looks over the weapons carried by Swiss police posing for a picture with him as he departs Geneva Wednesday, Jan. 14, 2015. U.S. Secretary of State Kerry and Iranian Foreign Minister Mohammed Javad Zarif met for six hours Wednesday, a day before negotiators from Iran, the five permanent members of the U.N. Security Council and Germany are to resume talks here. (AP Photo/Rick Wilking, Pool)
U.S. Secretary of State John Kerry, left, waits with Iranian Foreign Minister Mohammad Javad Zarif before a meeting in Geneva, Switzerland Wednesday, Jan. 14, 2015. Zarif said on Wednesday that his meeting with Kerry was important to see if progress could be made in narrowing differences on his country's disputed nuclear program. (AP Photo/Rick Wilking, Pool)
U.S. Secretary of State John Kerry addresses the media after the closed-door nuclear talks with Iran, in Vienna, Austria, Monday, Nov. 24, 2014. Facing still significant differences between the U.S. and Iran, negotiators gave up on last-minute efforts to get a nuclear deal by the Monday deadline and extended their talks for another seven months. The move gives both sides breathing space to work out an agreement but may be badly received by domestic sceptics, since it extends more than a decade of diplomatic efforts to curb Iran's nuclear prowess. (AP Photo/Ronald Zak)
Delegations of US Secretary of State John Kerry, Britain's Foreign Secretary Philip Hammond, Russian Foreign Minister Sergei Lavrov, German Foreign Minister Frank-Walter Steinmeier, French Foreign Minister Laurent Fabius, Chinese Foreign Minister Wang Yi, , left side from left, Iranian Foreign Minister Mohammad Javad Zarif, center right, and former EU foreign pilicy chief Catherine Ashton, center,sit around the negotiations table during their talks on Iran, in Vienna, Austria, Monday, Nov. 24, 2014. (AP Photo/Joe Klamar, Pool)
Iranian Foreign Minister Mohammad Javad Zarif laughs with reporters before meeting with U.S. Secretary of State John Kerry in Geneva, Switzerland, Wednesday, Jan. 14, 2015. Zarif said on Wednesday that his meeting with Kerry was important to see if progress could be made in narrowing differences on his country's disputed nuclear program. (AP Photo/Rick Wilking, Pool)
U.S. Secretary of State John Kerry, left, shakes hands with Iranian Foreign Minister Mohammad Javad Zarif before a meeting in Geneva, Switzerland Wednesday, Jan. 14, 2015. Zarif said on Wednesday that his meeting with Kerry was important to see if progress could be made in narrowing differences on his country's disputed nuclear program. (AP Photo/Rick Wilking, Pool)
Iranian Foreign Minister Mohammad Javad Zarif talks with his French counterpart Laurent Fabius, during a meeting at the Quai d'Orsay, in Paris, Friday, Jan. 16, 2015. An American official says U.S. Secretary of State John Kerry will meet with his Iranian counterpart in Paris on Friday in what will be their second face-to-face encounter this week. (AP Photo/Thibault Camus)
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Yet even before the talks culminated in the preliminary outline of what needs be done, both sides warned of the hard work ahead. And the bickering began just a few hours after the sides signed off on their preliminary understanding.

"There is no need to spin using `fact sheets' so early on," tweeted Iranian Foreign Minister Mohammad Javad Zarif, in a reference to a public document released by the United States listing both sides' commitments. He also questioned some of the assertions contained in the document, such as the speed of a U.S. sanctions drawdown.

According to that text, many of the nuclear limits on Iran would be in place for a decade, while others would last 15 or 20 years. Sanctions related to Iran's nuclear programs would be suspended by the U.S. and the European Union and eased by the U.N. after the International Atomic Energy Agency confirmed Iran's compliance.

The fact sheet also says Tehran is committed to significant cuts in centrifuges, the machines that can spin uranium gas to levels used in nuclear warheads. Of the nearly 20,000 centrifuges Iran now has installed or running at its main enrichment site, the country would be allowed to operate just over 5,000. Much of its enriched stockpiles would be neutralized. A planned reactor would be reconstructed so it produced no weapons-grade plutonium. Monitoring and inspections by the U.N. nuclear agency would be enhanced.

Opponents of the emerging accord, including Israel and Republican leaders in Congress, reacted with skepticism. They criticized the outline for failing to do enough to curb Iran's potential to produce nuclear weapons or to mandate intrusive enough inspections. President Barack Obama, who seeks an Iran nuclear deal as a capstone of his presidency, disagreed.

"This framework would cut off every pathway that Iran could take to develop a nuclear weapon," Obama declared. "This deal is not based on trust. It's based on unprecedented verification."

America's negotiating partners in Europe strongly backed the result. President Francois Hollande of France, who had pushed the U.S. for a tougher stance, endorsed the accord while warning that "sanctions lifted can be re-established if the agreement is not applied."

Obama sought to frame the deal as necessary to reduce the chances of the combustible Middle East becoming even more unstable with the introduction of a nuclear-armed Iran. Many fear that would spark an arms race that could spiral out of control in a region rife with sectarian rivalry, terrorist threats and weak or failed states.

Obama said he had spoken with Saudi Arabia's King Salman and that he'd invite him and other Arab leaders to the presidential retreat at Camp David this spring to discuss security strategy. The Sunni-majority Saudis have made veiled threats about creating their own nuclear program to counter Shia-led Iran.

The American leader also spoke by telephone with Israeli Prime Minister Benjamin Netanyahu, perhaps the sharpest critic of the diplomacy with Iran. Netanyahu told Obama a deal based on the agreement "would threaten the survival of Israel." The White House said Obama assured Netanyahu that the agreement would not diminish U.S. concerns about Iran's sponsorship of terrorism and threats toward Israel.

Obama saved his sharpest words for members of Congress who have threatened to either try to kill the agreement or approve new sanctions against Iran. Appearing in the Rose Garden of the White House, he said the issues at stake are "bigger than politics."

"These are matters of war and peace," Obama said, and if Congress kills the agreement "international unity will collapse, and the path to conflict will widen."

Hawks on Capitol Hill reacted slowly to the news. House Speaker John Boehner said it would be "naive to suggest the Iranian regime will not continue to use its nuclear program, and any economic relief, to further destabilize the region."

Senate Foreign Relations Committee Chairman Bob Corker, R-Tenn., said his panel would vote this month on legislation giving Congress the right to vote on a final deal. Freshman Sen. Tom Cotton, R-Ark., who penned a letter that many GOP senators signed last month to Iran's leaders, said he would work "to protect America from this very dangerous proposal."

In a joint statement, European Union foreign policy chief Federica Mogherini and Iran's Zarif called the agreement a "decisive step."

All sides spoke with a note of caution.

"We have taken a major step, but are still some way away from where we want to be," Zarif told reporters, even as he voiced hope that a final agreement might ease suspicion between the U.S. and Iran, which haven't had diplomatic relations since the 1979 overthrow of the shah and the subsequent U.S. Embassy hostage crisis in Tehran.

Kerry lashed out at critics who wanted tougher caps on Iran's nuclear assets.

"Simply demanding that Iran capitulate makes a nice sound bite, but it is not a policy," Kerry said. "It is not a realistic plan."

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