Iranian President Hassan Rohani vowed on Wednesday that his government will never develop nuclear weapons, his strongest signal yet that he may be seeking a diplomatic thaw with the West after decades of acrimony.
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In an interview with NBC News days before he travels to New York for a UN appearance, the new Iranian president also insisted that he has "complete authority" to negotiate a nuclear deal with the United States and other Western powers.
"We have time and again said that under no circumstances would we seek any weapons of mass destruction, including nuclear weapons, nor will we ever," Rohani said when asked whether he would forswear nuclear arms.
Rohani's conciliatory comments appeared to be another sign of his willingness to work toward a diplomatic solution in Iran's bitter nuclear standoff with the West. Washington and its allies are intrigued but still wary, making clear they hope to see tangible steps to back up his words.
Speaking to the U.S. network at his presidential compound in Tehran, Rohani said the tone of a letter he had received from President Barack Obama, part of a recent exchange of messages between the leaders, was "positive and constructive."
"It could be subtle and tiny steps for a very important future," Rohani said six days before he is due to address the U.N. General Assembly, a speech that will be closely watched for fresh diplomatic overtures.
Iran's Supreme Leader, Ayatollah Ali Khamenei, has said that nuclear weapons development would be inconsistent with Islamic values. But a willingness by a newly elected president to rule out nuclear arms could help provide a new opening in long-stalled international nuclear talks.
Questions remain about how much bargaining room Khamenei, a staunch promoter of Iran's nuclear program, will give his negotiators, whether in secret talks with Washington or in multilateral discussions with major powers.
Comments on Tuesday by Khamenei about the need for "flexibility" suggests a new willingness at the highest level to explore a compromise solution to Tehran's dispute with the West.
"This government enters with full power and has complete authority," Rohani said, according to an NBC translation. "I have given the nuclear negotiations portfolio to foreign ministry. The problem won't be from our side. We have sufficient political latitude to solve this problem."
The White House responded cautiously. "The world has heard a lot from President Rohani's administration about its desire to improve the government of the Islamic Republic of Iran's relations with the international community, and President Obama believes we should test that assertion," White House spokeswoman Bernadette Meehan said.
"We hope that this new Iranian government will engage substantively in order to reach a diplomatic solution that will fully address the international community's concerns about Iran's nuclear program."
The United States and its allies suspect Iran is seeking bomb-making capability despite Tehran's insistence that its program has only peaceful aims. Israel, believed to be the Middle East's only nuclear weapons power, has repeatedly called for a credible military threat to halt Iran's nuclear advance.
Since Rohani was elected president in June, the centrist cleric has called for "constructive interaction" with the world, a dramatic shift in tone from the strident anti-Western rhetoric of his predecessor, Mahmoud Ahmadinejad.
Obama said in a television interview on Tuesday that he was prepared to test Rohani's willingness to open a nuclear dialogue, but he did not back away from previous U.S. demands.
The United States and Iran cut diplomatic relations in 1980, after students and Islamic militants stormed the U.S. Embassy in Tehran and took American diplomats hostage.
Obama ran for president in 2008 in part by vowing to engage with Iran. But Tehran continued its nuclear development and tough sanctions imposed by Washington and the United Nations have taken a severe toll on Iran's economy.