http://www.newsweek.com/id/231991

Two schools of thought have traditionally competed to determine how America should approach the world. Realists believe we should care most about what states do beyond their borders—that influencing their foreign policy ought to be Washington’s priority. Neoconservatives often contend the opposite: they argue that what matters most is the nature of other countries, what happens inside their borders. The neocons believe this both for moral reasons and because democracies (at least mature ones) treat their neighbors better than do authoritarian regimes.

I am a card-carrying realist on the grounds that ousting regimes and replacing them with something better is easier said than done. I also believe that Washington, in most cases, doesn’t have the luxury of trying. The United States must, for example, work with undemocratic China to rein in North Korea and with autocratic Russia to reduce each side’s nuclear arsenal. This debate is anything but academic. It’s at the core of what is likely to be the most compelling international story of 2010: Iran.

In the wake of 9/11, the Bush administration judged incorrectly that Iran was on the verge of revolution and decided that dealing directly with Tehran would provide a lifeline to an evil government soon to be swept away by history’s tide. A valuable opportunity to limit Iran’s nuclear program may have been lost as a result. The incoming Obama administration reversed this approach and expressed a willingness to talk to Iran without preconditions. This president (like George H.W. Bush, whose emissaries met with Chinese leaders soon after Tiananmen Square) is cut more from the realist cloth. Diplomacy and negotiations are seen not as favors to bestow but as tools to employ. The other options—using military force against Iranian nuclear facilities or living with an Iranian nuclear bomb—were judged to be tremendously unattractive. And if diplomacy failed, Obama reasoned, it would be easier to build domestic and international support for more robust sanctions. At the time, I agreed with him.

I’ve changed my mind. The nuclear talks are going nowhere. The Iranians appear intent on developing the means to produce a nuclear weapon; there is no other explanation for the secret uranium-enrichment facility discovered near the holy city of Qum. Fortunately, their nuclear program appears to have hit some technical snags, which puts off the need to decide whether to launch a preventive strike. Instead we should be focusing on another fact: Iran may be closer to profound political change than at any time since the revolution that ousted the shah 30 years ago.

The authorities overreached in their blatant manipulation of last June’s presidential election, and then made matters worse by brutally repressing those who protested. Supreme Leader Ayatollah Ali Khamenei has lost much of his legitimacy, as has the “elected” president, Mahmoud Ahmadinejad. The opposition Green Movement has grown larger and stronger than many predicted.

The United States, European governments, and others should shift their Iran policy toward increasing the prospects for political change. Leaders should speak out for the Iranian people and their rights. President Obama did this on Dec. 28 after several protesters were killed on the Shia holy day of Ashura, and he should do so again. So should congressional and world leaders. Iran’s Revolutionary Guards should be singled out for sanctions. Lists of their extensive financial holdings can be published on the Internet. The United States should press the European Union and others not to trade or provide financing to selected entities controlled by the Guards. Just to cite one example: the Revolutionary Guards now own a majority share of Iran’s principal telecommunications firm; no company should furnish it the technology to deny or monitor Internet use.

New funding for the project housed at Yale University that documents human-rights abuses in Iran is warranted. If the U.S. government won’t reverse its decision not to provide the money, then a foundation or wealthy individuals should step in. Such a registry might deter some members of the Guards or the million-strong Basij militia it controls from attacking or torturing members of the opposition. And even if not, the gesture will signal to Iranians that the world is taking note of their struggle.

It is essential to bolster what people in Iran know. Outsiders can help to provide access to the Internet, the medium that may be the most important means for getting information into Iran and facilitating communication among the opposition. The opposition also needs financial support from the Iranian diaspora so that dissidents can stay politically active once they have lost their jobs.

Just as important as what to do is what to avoid. Congressmen and senior administration figures should avoid meeting with the regime. Any and all help for Iran’s opposition should be nonviolent. Iran’s opposition should be supported by Western governments, not led. In this vein, outsiders should refrain from articulating specific political objectives other than support for democracy and an end to violence and unlawful detention. Sanctions on Iran’s gasoline imports and refining, currently being debated in Congress, should be pursued at the United Nations so international focus does not switch from the illegality of Iran’s behavior to the legality of unilateral American sanctions. Working-level negotiations on the nuclear question should continue. But if there is an unexpected breakthrough, Iran’s reward should be limited. Full normalization of relations should be linked to meaningful reform of Iran’s politics and an end to Tehran’s support of terrorism.

Critics will say promoting regime change will encourage Iranian authorities to tar the opposition as pawns of the West. But the regime is already doing so. Outsiders should act to strengthen the opposition and to deepen rifts among the rulers. This process is underway, and while it will take time, it promises the first good chance in decades to bring about an Iran that, even if less than a model country, would nonetheless act considerably better at home and abroad. Even a realist should recognize that it’s an opportunity not to be missed.

Haass, president of The Council on Foreign Relations, is author of War of Necessity, War of Choice: A Memoir of Two Iraq Wars.