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Iran鈥檚 acceptance this week of a deal to freeze much of its nuclear program for at least six months is placing a new spotlight on economic sanctions as a tool for getting outlier nations to 鈥測es鈥� on stopping activities the international community finds objectionable.

The unprecedented sanctions that the US and other international players, in particular the European Union (EU), placed on Iran鈥檚 economy in recent years played a key role in bringing Iran to the negotiating table, international affairs analysts widely agree.

But Iran鈥檚 situation may have been almost tailor-made for sanctions to produce results, some experts say. A large middle-class population had just this year brought to power a new president with a mandate to relieve Iranians鈥� economic pain, they note, and to fashion a new, less combative relationship between Iran and the wider world 鈥� including arch-enemy America.

That combination of widespread public demands for sanctions relief and a change in Iran鈥檚 political order 鈥� from the fiery and sanctions-mocking (publicly, at least) President Mahmoud Ahmadinejad to the more temperate and internationalist President Hassan Rouhani 鈥� played a key role in bringing Iran to the table.

鈥淭here鈥檚 no question that the sanctions have had an impact on [Iran鈥檚 nuclear] program, and that they helped bring the new government to power,鈥� says William Luers, director of the Iran Project at the Carnegie Endowment for International Peace in Washington. 鈥淏ut [the Iranians] want more than money and access [to markets], they are looking for a change in their relations with the region.鈥�

Mr. Luers calls President Rouhani 鈥渢he Deng Xiaoping of Iran鈥� 鈥� referring to the Chinese leader who orchestrated China鈥檚 economic transformation.

Yet, as important as the arrival of Rouhani may have been, it was equally important that Iran was facing international powers 鈥� including, critically, the US 鈥� that were ready to give priority to diplomacy and to begin rewarding Iran in exchange for specific actions, other experts say.

鈥淵es, the sanctions were critical, but the possibility of reciprocal action was also important,鈥� says George Lopez, an international economic sanctions expert in Washington.

The prospect of real incentives brought Iran to the table, he adds, and now that a short-term deal is in hand, the next phase 鈥� the six months of negotiations aimed at reaching a comprehensive deal 鈥� should be about 鈥渁stute rewards for other concessions.鈥�

That means now is not the time to pile on new sanctions, as some in Congress are demanding, he says. 鈥淭here鈥檚 the thought out there that once your foot is on the other guy鈥檚 neck you ought to stomp on it once or twice to make sure he gets the message,鈥� says Dr. Lopez, who is vice president of the US Institute of Peace鈥檚 Academy for International Conflict Management and Peacebuilding in Washington. 鈥淏ut it鈥檚 more likely to be counterproductive.鈥�

On Tuesday, Secretary of State John Kerry sent a video to members of Congress in which he argues for a pause in any new sanctions legislation. Kerry says that 鈥渆verybody knows鈥� that sanctions will be reinforced if Iran violates the terms of the interim deal, but he insists that new sanctions now could throw off the best chance of stopping Iran from obtaining a nuclear weapon through diplomacy.聽

Lopez, who has worked with the United Nations on sanctions implementation related to North Korea, says that sanctions aimed at nuclear nonproliferation are different from other kinds of sanctions 鈥� those addressing human rights violations, for example 鈥� because they target a specific program that has physical parts and materials that can be forbidden.

鈥淵ou can be product-focused and concentrate on certain kinds of trade,鈥� Lopez says.

Another critical factor in the 鈥渟uccess鈥� of Iran sanctions was what Lopez calls a 鈥渕ultileveling,鈥� under which United Nations sanctions focused on the nuclear program, while the US and EU went further with targeted sanctions on Iran鈥檚 currency and oil revenues.

It was those latter sanctions that hit Iran鈥檚 economy with intensifying force 鈥� and which helped build public pressure for a new direction with the outside world.

But Lopez notes that the US had to be wary of 鈥渂ad PR鈥� from indiscriminate application of economic sanctions. US officials no doubt had in the back of their mind the nightmare the US faced from reports of the 鈥渂aby-killing鈥� sanctions the US imposed on Iraq under Saddam Hussein.

Another point is that the 鈥渕ultileveling鈥� of sanctions that Iran has been subject to would not work everywhere. In the case of North Korea, the absence of a middle-class population used to a comfortable standard of living and to consuming imported products made targeted economic sanctions unrealistic and ineffective.

Nor does the North Korean dictatorship permit a politically franchised and engaged population that would be able to express its will at the ballot box.

鈥淲ith North Korea you鈥檝e got to hurt the elites, even as you continue to contain the materials that feed their program,鈥� he says. 鈥淚t鈥檚 a very different approach.鈥�

In the Iran case, the challenge now for world powers will be to demonstrate 鈥� to Iranians and to the world -- that the sanctions were not an end, but a means.

鈥淭he interesting question is, can we take the sanctions that created these negotiations [and] now use them to put in concrete 鈥� the best possible arrangement" for permanently and verifiably stopping Iran short of obtaining a nuclear weapon, says Thomas Pickering, a retired career ambassador who works with the Iran Project, a bipartisan group of former US officials seeking improved engagement between the US and Iranian governments.聽 聽聽聽聽聽

The US and world powers should now focus on using the sanctions 鈥渃reatively,鈥� he says, 鈥渢o achieve a limitation of the [Iranian] program.鈥�