Director General of the International Atomic Energy Agency, IAEA, Yukiya Amano, center, from Japan speaks to the media after returning from Iran at the Vienna International Airport near Schwechat, Austria, on Tuesday, May 22, 2012. Amano says he has reached a deal with Iran on probing suspected work on nuclear weapons and adds that the agreement will "be signed quite soon." (AP Photo/Ronald Zak)
Director General of the International Atomic Energy Agency, IAEA, Yukiya Amano, center, from Japan speaks to the media after returning from Iran at the Vienna International Airport near Schwechat, Austria, on Tuesday, May 22, 2012. Amano says he has reached a deal with Iran on probing suspected work on nuclear weapons and adds that the agreement will "be signed quite soon." (AP Photo/Ronald Zak)
Director General of the International Atomic Energy Agency, IAEA, Yukiya Amano, right, from Japan speaks to the media after returning from Iran at the Vienna International Airport near Schwechat, Austria, on Tuesday, May 22, 2012. Amano says he has reached a deal with Iran on probing suspected work on nuclear weapons and adds that the agreement will "be signed quite soon." (AP Photo/Ronald Zak)
Iraqis walk through Tahrir Square during a heavy sandstorm in Baghdad, Iraq, Tuesday, May 22, 2012. The sandstorm prompted the shutdown of Baghdad's airport on Monday and brought travel complications for envoys trying to reach the Iraqi capital for nuclear talks between Iran and six world powers scheduled to begin Wednesday. (AP Photo/Hadi Mizban)
Traffic snakes through Kahramana Square during a heavy sandstorm in Baghdad, Iraq, Tuesday, May 22, 2012. The sandstorm prompted the shutdown of Baghdad's airport on Monday and brought travel complications for envoys trying to reach the Iraqi capital for nuclear talks between Iran and six world powers scheduled to begin Wednesday.(AP Photo/ Khalid Mohammed)
Iraqi Foreign Affairs Minister Hoshyar Zebari speaks during an interview with the Associated Press in Baghdad, Iraq, Tuesday, May 22, 2012. The five permanent U.N. Security Council members plus Germany,would resume talks with Iran about its nuclear program on Wednesday in Baghdad's fortified Green Zone. Zebari said they will "not produce a miracle." (AP Photo/Khalid Mohammed)
BAGHDAD (AP) ? Iran has made the first move in attempts to gain an edge in nuclear talks with the U.S. and other world powers: It agreed in principle to allow U.N. inspectors to restart probes into a military site suspected of harboring tests related to atomic weapons.
The tentative accord ? announced Tuesday as envoys headed to the Iraqi capital for negotiations ? is likely to be used by Iran as added leverage to seek concessions from the West on sanctions. But U.S. officials have shown no willingness to shift into bargaining mode so quickly, setting the stage for possible tense moments after talks set for Wednesday resume in Baghdad's fortified Green Zone.
Still, Iran's move raises the pressure on the West for some reciprocal gestures to keep dialogue on track and further highlights Tehran's apparent aims of opening a long give-and-take process over its nuclear ambitions.
A major breakthrough in the impasse was not expected in Baghdad, with officials and experts saying both sides will seek to demonstrate enough progress to keep the process moving forward.
That could cool down worries in international markets over possible military action, but reinforce the suspicions of Israeli leaders who claim Iran seeks only to buy time to keep up its production of nuclear fuel.
Iran's envoys, meanwhile, promoted the Baghdad round as an opportunity to set aside past obstacles.
"That is the basis for the beginning of a new cooperation," said Saeed Jalili, the top Iranian nuclear negotiator, who arrived in Baghdad late Monday. "We hope that the talks in Baghdad will be a kind of dialogue that will give shape to such cooperation."
Iran's ambassador to Iraq, Hasan Danaeifar, said the Baghdad talks could be historic.
"Should the talks set a start for a serious, constructive settlement of the issues, it could be a historic meeting for all sides," the official IRNA news agency quoted him as saying.
A senior Western diplomat in Baghdad said sanctions on Iran's oil exports, set to take effect July 1, likely pushed Tehran to the bargaining table.
"I don't think the Iranians are coming to these talks because they suddenly changed their minds about anything. They are coming to these talks because sanctions are beginning to bite," the diplomat said in an interview this week with The Associated Press. He spoke on condition of anonymity to discuss the negotiations candidly.
In Iranian terms, that means offering some possible accommodations ? such as opening to greater U.N. inspections ? but sticking to its right to enrich uranium as a signatory of U.N. nuclear treaties. The Baghdad talks, involving the five permanent U.N. Security Council members plus Germany, could offer a test of how much the U.S. and allies are willing to bend from demands for Iran to halt to all enrichment and instead concentrate on just stopping the highest-grade production.
The West and others fear the 20 percent-level enrichment can be turned quickly into weapons-grade of over 90 percent.
Iran has repeatedly denied it seeks nuclear arms and says its reactors are only for power and medical research.
On Tuesday, the official Islamic Republic News Agency reported that Iranian scientists had inserted a domestically made fuel rod, which contains pellets of 20 percent enriched uranium, into the core of a research nuclear reactor in Tehran.
The advance would be another step in achieving proficiency in the entire nuclear fuel cycle. Iran said in January that it had produced the first nuclear fuel rod, and that it had to find a way to make them because Western sanctions prohibit their purchase from foreign markets.
Western claims about a clandestine atomic weapons program have often cited Iran's Parchin military facility, where the U.N.'s International Atomic Energy Agency believes Iran in 2003 ran explosive tests needed to set off a nuclear charge. Iran describes Parchin as a conventional military site.
The agency's chief, Yukiya Amano, returned to Vienna on Tuesday from a one-day trip to Tehran and said an agreement is within reach to give inspectors "access to sites, scientists and documents it seeks to restart its probe."
He noted that some differences still exist but claimed they "will not be an obstacle to reach agreement." He gave no details on the unsettled points or when the pact could be signed.
Amano's remarks brought a measured response from Washington and allies.
White House press secretary Jay Carney called the announcement a "step forward" and "a step in the right direction." But he stressed that the administration will "make judgments about Iran's behavior based on actions, not just promises or agreements."
"We judge and will judge Iran by its actions," Carney said, adding that "we're not at the stage of negotiating what Iran would get in return for fulfillment of its obligations."
In Germany, Foreign Minister Guido Westerwelle said the apparent inspection pact was an "overdue step in the right direction."
But he added: "The aim is to make progress not just atmospherically but also on substance."
Israel's defense minister, Ehud Barak, dismissed it as a "deception of progress" to stave off international pressure.
"It looks like the Iranians are trying to reach a technical agreement that will create a deception of progress in talks in order to reduce the pressure ahead of talks tomorrow in Baghdad and postpone harshening of sanctions," Barak said, according to a statement from his office.
On Monday, the U.S. Senate backed proposals for further sanctions on Iran, including requiring companies listed on U.S. stock exchanges to disclose any Iran-related business. U.S. and European measures already have targeted Iran's oil exports ? its chief revenue source ? and effectively blocked the country from international banking networks.
Even before the meetings begin in Baghdad, expectations were kept in check.
Iraqi Foreign Minister Hoshyar Zebari said they will "not produce a miracle."
"But everybody is looking for some tangible steps on the basis of reciprocity," Zebari told AP in an interview.
Zebari said there is consensus in Iran for the first time to reach a diplomatic deal.
Mahdi Mohtashami, an analyst and former Iranian foreign ministry official, said "the two sides should begin with small steps, not big demands, if they are to make any progress."
The U.S. has been vague about its immediate goals, with officials saying the talks will gauge Iran's seriousness and explore elements of a possible agreement.
President Barack Obama opposes a near-term military strike on Iran's nuclear facilities. He has pressed Israel to give diplomacy and sanctions time to work while insisting that military options are available should talks fail. Republicans have criticized Obama for holding talks with Iran at all.
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Associated Press writers George Jahn in Vienna, Brian Murphy in Dubai, Nancy Benac in Washington and Josef Federman in Jerusalem contributed to this report.
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