Ali Asghar Soltanieh said an IAEA report proves Iran is developing a nuclear program that will provide energy.
Mr Obama and Mr Medvedev met during a nuclear summit in the South Korean capital Seoul.
Both say they want to prevent Iran from gaining the technology to build a nuclear bomb.
It has threatened to use nuclear weapons and said it would restart a nuclear reactor.
BBC: UN chief Ban: Korea crisis could become 'uncontrollable'
The US blames Pakistan for the attack, leading to a nuclear strike against Pakistan.
Lastly, there is the possibility of a nuclear war triggered by something other than a state.
It was powered by a nuclear generator and bristled with lasers, scoops, cameras, and mechanical claws.
The greatest danger is a nuclear Iran -- so you said, so you do.
No one should be surprised that Iran is on the cusp of having a nuclear weapon.
Monitors say the new machines could significantly reduce the time needed to make a nuclear bomb.
Both men said the decision could lead to a nuclear arms race in Asia.
Such a purchase would substantially shorten the time before Iran could have a nuclear weapon.
We are committed to ensuring that the Iranians do not acquire a nuclear weapon.
But if the American imperialists provoke us unjustifiably, we will answer with a nuclear war.
In the 1960s, a Democrat ad hinted that Barry Goldwater might start a nuclear war.
The world has gone over sixty years without another detonation of a nuclear weapon in warfare.
CENTERFORSECURITYPOLICY: A Nuclear Iran: The Case for Action
Will the Middle East see a nuclear-arms race as rival nations try to catch up?
WSJ: The Weekend Interview with Olli Heinonen: How Iran Went Nuclear
There is no evidence that either capital is seriously considering a nuclear weapons program.
WSJ: China Benefits From North Korea's Crazy Blustering �� Letters to the Editor
Is it against a nuclear-armed adversary or one with only limited long-range strike capabilities?
CENTERFORSECURITYPOLICY: Section IV: Building a Two-MRC Force for the 21st Century
Revere said the latest crisis had made acceptance of a nuclear North Korea even more unconscionable.
Israel and the US say the site was a nuclear plant in the making.
It is no exaggeration to say that a nuclear Iran represents an existential threat to Israel.
They've made more bombs, and of course they exploded a nuclear bomb in October.
The Tribunal has already claimed jurisdiction over a nuclear power plant ashore in Great Britain!
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In the aftermath many new problems arose, but they pale in comparison to a nuclear holocaust.
The strategy will be overseen by a Nuclear Industry Council, co-chaired by ministers and industry.
BBC: Nuclear power: UK will get help to compete, say ministers
Luckily, as an investor in uranium, you don't have to bet on a nuclear renaissance.
This is a solvable problem -- if, in fact, Iran is not pursuing a nuclear weapon.
Today, the state news agency aired a commentary accusing the US of planning a nuclear attack.
Iran has a nuclear development program that it insists is for peaceful energy purposes.
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