• Reuters

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Last week’s advance by Sunni insurgents in Iraq provides a powerful argument for why Iran and Saudi Arabia should bury their Cold War-style feud, but is nonetheless likely to set back detente between the Persian Gulf’s dominant Sunni and Shiite powers.

After decades of often overt Saudi-Iranian hostility that polarized the Middle East — and three years of proxy war in Syria — the Sunni monarchy and Shiite revolutionary state had gingerly begun in recent months to explore ways to reach out.

Saudi Arabia announced in May it had invited Iranian Foreign Minister Mohammed Javad Zarif to make a rare visit. Earlier this month, the emir of Kuwait — a Sunni monarch and close Saudi ally — made the first visit to Iran by a Kuwaiti head of state since the 1979 Iranian Revolution. He met Supreme Leader Ali Khamenei.

With Syria’s civil war stalemated, unrest spreading across the region and Iran seeking a nuclear deal with the West, Tehran and Riyadh have reasons to seek a way to cooperate, as they have occasionally done so in the past. Diplomats say that at very least they could be looking for a way to avoid making the situation in the region worse.

Last week’s lightning advance across Iraq by the Islamic State of Iraq and Syria reinforces the argument for a rapprochement: Tehran and Riyadh both share the fear that Iraq could disintegrate into a sectarian bloodbath dangerous to all.

But in the short term, ISIS’s advance is likely to raise suspicions, which will only make any thaw more difficult.

“The Saudi-Iran rapprochement must now be on hold,” Jamal Khashoggi, head of a television news station owned by Saudi billionaire Prince Alwaleed bin Talal, said.

ISIS, an offshoot of al-Qaida that denounces the global Sunni jihadist group for not being extreme enough, is most obviously an enemy of Iran: it considers all Shiites to be heretics deserving death and slaughters hundreds of Shiite civilians a month in daily bombings in Iraq.

But it is also no friend of Riyadh, having battled Saudi Arabia’s allies in infighting among Sunni rebels in Syria.

Riyadh last month designated ISIS a terrorist organization, underscoring concern that young Saudis hardened by battle could come home to target the ruling al-Saud royal family — as happened after the wars in Afghanistan and Iraq.

ISIS’s ruthlessness means that Riyadh will not welcome its advances, even if they come at the expense of Iraqi Prime Minister Nouri al-Maliki, a Shiite that Saudi Arabia regards as Iran’s pawn.

“In normal circumstances, Saudi Arabia might welcome the humbling of al-Maliki, but an anarchic Iraq partly controlled by violent Islamic radicals would be hugely unwelcome,” said Shaul Bakhash, a professor at Virginia’s George Mason University.

But publicly, Saudi Arabia has yet to condemn ISIS’s advance. Tehran is likely to see that ambiguity as confirmation that the kingdom is a Sunni supremacist power, unwilling to cooperate against a Sunni foe, even if it poses a mutual threat.

“There will be additional tensions between Iran and Saudi Arabia” unless the Saudis openly condemn ISIS’s push, said Mohsen Milani, an Iran expert at the University of South Florida.

Whether or not Tehran directly blames Riyadh for ISIS’s actions, it is bound to see it as an outgrowth of Saudi Arabia’s promotion of Sunni armed groups in Syria, fighting against Iran’s ally, Syrian President Bashar Assad.

Iran has long warned gulf states that they risk a blowback by supporting “takfiri” militants, Sunnis who proclaim followers of other sects of Islam to be “kafirs” — infidels — and therefore legitimate targets of holy war.

“Unfortunately, a number of regional countries are not aware of the danger that takfiri groups will cause for them in the future and they are still supporting these groups,” Khamenei said after his meeting with the Kuwaiti emir.

Last week, the Islamic Revolution’s Guard Corps’ deputy commander, Brig. Gen. Hossein Salami, blamed ISIS’s activities on “the meddling of bullying powers and their allies in the region”— code for gulf states allied to the West.

For its part, Riyadh’s worry is that Iran will respond to ISIS’s advance by sending weapons, advisers and cash to strengthen both the Shiite-led government in Baghdad and Shiite sectarian militia mobilizing to fight against ISIS.

Riyadh sees an Iranian hand not only in supporting Syria’s Assad but also in fueling Shiite unrest in Bahrain, Yemen and even potentially among Saudi Arabia’s own Shiite minority.