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In this July 14, 2015 file photo, jubilant Iranians celebrate a landmark nuclear deal in Tehran, Iran. World powers and Iran struck a historic deal to curb Iran's nuclear program in exchange for billions of dollars in relief from international sanctions.
Ebrahim Noroozi, AP File
In this July 14, 2015 file photo, jubilant Iranians celebrate a landmark nuclear deal in Tehran, Iran. World powers and Iran struck a historic deal to curb Iran’s nuclear program in exchange for billions of dollars in relief from international sanctions.

A year after its activation, the Joint Comprehensive Plan of Action has achieved its chief purpose: slowing Iran’s nuclear advances and insuring through tight verification that the country cannot amass sufficient material to make a single nuclear weapon.

The administration of Donald J. Trump, due to take office four days after the comprehensive plan’s first anniversary, would be wise to continue implementing the agreement while it reviews overall U.S. policy toward Iran. Indeed as CIA director John Brennan told the BBC recently, scrapping the deal would be the “height of folly.”

Thanks to the plan of action, whose chief Iranian negotiator was Foreign Minister and University of Denver PhD Javad Zarif, for the past year and the ensuing 14, Iran cannot: legally possess more than 300 kilograms of low-enriched uranium, enrich uranium to a dangerous grade, or produce bomb fuel in an underground bunker. Iran is also barred from making mass quantities of plutonium and from constructing a facility to reprocess plutonium. Indeed, assuming Iran continues to implement the accord, its nuclear program will be, in the words of Ploughshares Fund president Joe Cirincione, “shrink-wrapped” for more than a decade.

This major non-proliferation achievement allows the U.S. and its allies to focus on other areas of concern with Iran.

Contrary to the hopes of some of its supporters, the nuclear accord has so far not produced dramatic improvement in U.S.-Iran bilateral ties or in Iran’s relations with its Arab neighbors. Iran has continued to jail Iranian-Americans and other dual nationals on bogus charges, to test ballistic missiles and to intervene in regional conflicts including in such places as Yemen, which have little direct bearing on Iran’s national interests.

Had Hillary Clinton been elected president, she would likely have taken a harder line regarding these other Iranian policies; it is not yet clear whether Trump will do the same. He should take note, however, that many of Iran’s regional adversaries – including Saudi Arabia and Israel — are now urging him not to scrap the plan of action. Their concern with the nuclear agreement was never so much about its non-proliferation aspects as about fear that it symbolized a U.S. tilt toward Tehran. That was far-fetched under President Barack Obama and seems even more unlikely under the incoming administration.

Misguided and poorly executed U.S. policies, such as the invasion of Iraq under the George W. Bush administration and the subsequent withdrawal of U.S. combat troops under Obama, gave Tehran the opportunity to fill the power vacuum left by the fall of Saddam Hussein in Iraq. Obama’s reluctance to robustly support the Syrian opposition before Iran and Russia intervened heavily on the side of Bashar al-Assad makes it harder to achieve a durable cease-fire and political settlement in Syria.

Given Iran’s entrenched role in both Syria and in Iraq, it is unrealistic to exclude Iran from deliberations about those countries’ political futures. But that doesn’t mean the U.S. should allow Tehran to roll over core U.S. interests or those of its allies.

The Trump administration can, of course, act unilaterally to impose more sanctions on the Iranian Revolutionary Guards or work harder to interdict arms supplies to Assad and Yemen’s Houthi rebels. However, U.S. policies work best when they are embraced by a coalition of like-minded nations – as was the case with the protracted negotiations that led to the nuclear agreement.

U.S. European allies, in particular, have made it clear that they will not walk away from the nuclear agreement, barring a major Iranian violation, and that they will not re-impose economic sanctions on Iran just because Washington decides to do so. Abrogating the agreement would cause an early and unnecessary crisis in transatlantic relations and likely benefit Russia, China and the most anti-American elements in the Iranian system.

As a dealmaker, President-elect Trump understands that it is not advisable to rip up a contract that is continuing to deliver benefits. He will face many difficult decisions upon taking office on Jan. 20 but thanks to the Joint Comprehensive Plan of Action, there will be no early nuclear crisis with Iran.

Ryan Crocker is Executive Professor at Texas A&M University and a former Ambassador to a number of Middle Eastern countries. Barbara Slavin is Acting Director of the Future of Iran Initiative at the Atlantic Council. Crocker and Slavin will be in Denver on Dec. 14 for a conversation with Ambassador Chris Hill about “Middle East Policy in the New Administration.” The WorldDenver event is 5:30 to 7:30 PM at the Westin Denver Downtown, 1672 Lawrence St.