Is Iran the United States’ new best friend in the Middle East?

Iran denounced the US suggestion that it play a role on the sidelines of the second United Nations Syria peace conference this month because the minimal role “does not respect its dignity,” a foreign ministry spokeswoman said Monday.

But with skyrocketing sectarian violence throughout the region, particularly in Syria and Iraq, and the US beginning to withdraw its troops from Afghanistan, Iran’s active involvement in the region is seen as increasingly important, The New York Times reports, describing Iran as an "island of stability."

The Geneva II conference is set to begin Jan. 22, and will include more than 20 countries invited by the UN as well as representatives from Syria’s opposition. The UN special envoy to Syria, Lakhdar Brahimi, supports Iran’s participation in the Syrian peace process, and on Sunday, US Secretary of State John Kerry said Tehran could “participate very easily” in the talks if they accept that the Assad regime must be replaced by a transitional government.

"If Iran doesn't support that, it's difficult to see how they are going to be a ministerial partner in the process," Mr. Kerry said, noting that there are ways they could “conceivably” contribute from the sidelines.

Despite warming ties between Washington and Tehran in recent months – most notably with the November agreement to temporarily freeze Iran’s nuclear development – the two nations have been on opposite ends of the Syria fight. Over the course of the three-year conflict in Syria which has claimed the lives of more than 100,000 people and displaced millions more, Iran has provided military assistance and manpower to the regime of President Bashar al-Assad. According to The Christian Science Monitor:

Since its 1979 Islamic revolution, Iran has used Syria as a conduit for weapons, cash, and support for the Lebanese Shiite militant group Hezbollah, and later Hamas and Islamic Jihad, all of which form a frontline against Israel. If Assad falls, Iran could lose that channel. 

Reuters reports that the US State Department spokesman said that for Iran to have a role in the Syria peace talks, “they would have to demonstrate that they would do things that would be less destructive in Syria."

The New York Times reports that while the US and Iran “quietly continue to pursue their often conflicting interests, they are being drawn together by their mutual opposition to an international movement of young Sunni fighters, who with their pickup trucks and Kalashnikovs are raising the black flag of Al Qaeda along sectarian fault lines in Syria, Lebanon, Iraq, Afghanistan and Yemen.” On Monday, Iran offered to join the US in sending military aid to the Iraqi government, which is engaged in a fierce struggle to oust Sunni militants from Iraq's Anbar province. 

With Iran as an island of stability in a region plagued by violent protests, sectarian clashes and suicide bombers, there are not that many options left for Washington, experts here say.

“We face the same enemy, and the enemy of my enemy is my friend,” said Mashallah Shamsolvaezin, a prominent Iranian reformist journalist who closely follows the Arab world. He recalled how Iranian intelligence operatives gave reliable information to American Special Forces troops battling Iran’s enemy, the Afghan Taliban, in 2001.

While the Obama administration acknowledges that Iran has the potential to be an influential player on regional issues from Afghanistan to Syria, senior officials have said they are keeping their focus tightly on the nuclear negotiations. Cooperation on any other issues, they said, hinges largely on coming to terms on Iran’s nuclear program.

On Monday, an unnamed senior State Department official told reporters that “There are ... steps that Iran could take to show the international community that they are serious about playing a positive role [in Syria]."

"Those include calling for an end to the bombardment by the Syrian regime of their own people. It includes calling for and encouraging humanitarian access." The official told Reuters that Iran hadn’t shown any evidence of taking these types of steps.

“The Americans are confessing Iran stands for peace and stability in this region,” Hamid Reza Tarraghi, a hard-line political analyst told The New York Times. “But when they invite us for a conference on Syria we are ‘allowed’ to be present on the ‘sidelines.’ This is insulting.”