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The framework of the Iran nuclear deal announced Thursday has set up the biggest test yet of President Obama's central foreign policy proposition: that dialogue and diplomacy are the best means of resolving differences with America鈥檚 adversaries.

Mr. Obama has already tested his premise with Myanmar, and more recently with Cuba, but their significance pales in comparison with the effort to block Iran鈥檚 path to a nuclear bomb through diplomacy and to return Iran 鈥渢o the community of nations,鈥� as the president says.

With Iran, the success of Obama鈥檚 vision will be determined not just by its success in reining in Tehran's nuclear ambition, but also by whether the dialogue that has been absent for nearly four decades can nudge Iran away from years of terrorism and destabilizing activity in the Middle East.

Obama acknowledges that his approach comes with no guarantees of success, but he insists that its prospects are better than the alternative of bombing Iran鈥檚 nuclear facilities 鈥� and very possibly setting off another war in the Middle East.

For their part, Obama鈥檚 critics worry that his concerns for his presidential legacy have led to acceptance of too low a bar for the Iranians to cross. Underlying the deal is a na茂ve conviction that countries like Iran yearn to be part of the international community, they say.

But Thursday was Obama's moment to make his case for relying on diplomacy to tackle tough challenges like Iran. A few hours after Secretary of State John Kerry concluded a surprisingly detailed and complex plan for limiting and inspecting Iran鈥檚 nuclear program, Obama was in the White House Rose Garden, calling diplomacy 鈥渙ur best option by far.鈥�

The goal is a final agreement signed by a June 30 deadline that commits Iran to a long list of nuclear program limitations and inspection regimes. With that, 鈥渨e will be able to resolve one of the greatest threats to our security, and to do so peacefully,鈥� Obama said.

The deal calls for the international community, including the United States, to lift the sanctions that have strangled the Iranian economy as Iran fulfills its obligations under the agreement. Obama said the economic relief would be 鈥減hased鈥� to correspond with the steps Iran is taking to implement the deal.

But he also emphasized that the nuclear limitations and inspections arrangements would be of varying duration. Some would last a decade, while some access for international inspectors would become permanent 鈥� essentially acting as tests of Iran鈥檚 behavior and of its readiness to make less mischief in its neighborhood.

Since Obama first extended America鈥檚 hand to Iran in his 2009 inaugural address, critics have attacked the approach for placing too much emphasis on understanding enemies while ignoring the needs and concerns of friends and allies.

If anything, that criticism has grown.

Administration officials say the president is keenly aware of the doubts and fears the overture to Iran has caused among America鈥檚 partners in the region. They say a key part of the effort to win US and global approval of the nuclear agreement will be reassuring those friends that engaging Iran does not mean abandoning them.

鈥淲e do understand that our partners in the region, the Gulf countries and our friend and ally in Israel, have very profound concerns about Iran鈥檚 support of terrorism and its destabilizing activities in the region,鈥� says a senior administration official.

As part of an effort to reassure those partners, Obama announced that he will invite the leaders of the Gulf Cooperation Council, including Saudi Arabia, to meet with him later this spring at Camp David.

He also said he would be speaking with Israeli Prime Minister Benjamin Netanyahu by phone Thursday night and assuring him that 鈥渢here is no daylight between us when it comes to our support for Israel鈥檚 security.鈥澛�

In his Rose Garden comments, Obama addressed the Iranian people directly, 鈥渟aying what I have said from the beginning of my presidency,鈥� that 鈥渨e are ready to engage you on the basis of mutual interest and mutual respect.鈥澛�

Those words may be well received on the streets of Tehran. The harder sell is more likely to be with the American people and a dubious Congress.

In his comments Thursday, Obama described the agreement modestly as a 鈥済ood deal鈥� and 鈥渢he best option.鈥�

The coming months will demonstrate how much others agree that diplomacy and dialogue are perhaps the least bad means of addressing the challenges posed by Iran.