Merkel said further sanctions would follow if Iran failed to meet its commitments.
If Iran acquires nuclear weapons, the desirability of investing in its oil sector may rise.
Sanctions should roll back, with Israel and Arab state endorsements, if Iran makes tangible progress in talks.
Conservatives are convinced that, if Iran embarked on negotiation, it might be forced to give too much.
If Iran shows any interest in taking it, the odds on getting an interim agreement would be greatly shortened.
Even if Iran lurches into a worst-case scenario, the aftermath will be severe, but the effects won't be lasting.
If Iran chooses to do so again, the Administration can easily dismiss the recent rumors as so much hot air.
President Obama's promise to "extend a hand" if Iran "unclenches its fist" may not be enough to break the logjam.
If Iran had not agreed to come clean, the agency would have reported it to the United Nations Security Council.
And if Iran fails to live up to its obligations by the end of the year, we'll take our next steps.
The cold hard facts are that the Middle East will be a very different place if Iran becomes a nuclear power.
He came in and he made it clear that we would engage with Iran if Iran was willing to change its behavior.
If Iran is obdurate, each set of sanctions leads to the next.
If Iran acquires nuclear weapons, the situation will become even more destructive.
Some American congressmen have called for an embargo on petrol imports if Iran does not come to terms over its controversial nuclear programme.
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Meanwhile the Europeans know that, if Iran is to be diverted from any nuclear weapons plans, their own inducements will not be enough.
U.S., European, Russian and Chinese officials say their offer of talks with Iran is still on the table if Iran suspends controversial nuclear activities.
Meanwhile in both Israel and America there were calls for the use of force not to be ruled out, if Iran continues to be defiant.
If Iran wants to show the world that it is not seeking a nuclear bomb, it will have to give a lot more ground yet.
Netanyahu said if Iran were to acquire nuclear weapons, it would endanger not only Israel, but also the West and moderate Arab regimes as well.
This represents a real threat to the U.S. If Iran goes nuclear the chances of facing a crisis similar to the 1962 Cuban crisis is higher.
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And, second of all, what do you make of skepticism that the U.S. would act if Iran crossed a line because nobody knows what the line is?
If that is the case, it is not only Israel that has much to fear if Iran breaks out of the Nuclear Non-Proliferation Treaty to go nuclear.
"When you back down into the specifics of the timing of when and if Iran decides to pursue a nuclear weapon, there may well be some differences, " he said.
The Organization of Petroleum Exporting Countries (OPEC) also warned that it could not replace the shortfall in crude if Iran was attacked and its supply taken off the market.
But a peaceful resolution of this issue is still possible, and far better, and if Iran changes course and meets its obligations, it can rejoin the community of nations.
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Consequently, it is universally recognized that if Iran becomes a nuclear power, Egypt, Saudi Arabia, Turkey and other states will begin developing their own nuclear arsenals in short order.
Production could be stabilized at 200, 000 barrels a day if Iran invested in gas reinjection--assuming it could get its hands on both the gas and the technology to use it.
But so far, at least, we haven't given away anything -- other than the opportunity for us to negotiate and see if Iran comes to the table in good faith.
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Over the weekend, their representatives to the International Atomic Energy Agency debated a plan to take a break from escalating sanctions if Iran agrees to stop expanding its uranium enrichment.
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