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Speaker of Iran's parliament Ali Larijani (L) meets with Grand Ayatollah Sheikh Bashir Hussain Najafi, one of the five Grand Ayatollahs in Iraq, during his visit to the Shiite Muslim holy city of Najaf, about 160 kilometres south of Baghdad, on December 23, 2014. AFP PHOTO / HAIDAR HAMDANI Image Credit: AFP

Washington: Iranian military involvement has dramatically increased in Iraq over the past year as Tehran has delivered desperately needed aid to Baghdad in its fight against Daesh militants, US, Iraqi and Iranian sources say. In the eyes of Obama administration officials, equally concerned about the rise of the brutal Islamist group, that’s an acceptable role - for now.

Yet American officials remain apprehensive about the potential for renewed friction with Iran as US troops return to a limited mission in Iraq, either directly or via Iranian-backed militias that once attacked US personnel on a regular basis.

A senior Iranian cleric with close ties to Tehran’s leadership, who spoke on the condition of anonymity to discuss security matters, said that since the Daesh captured much of northern Iraq in June, Iran has sent more than 1,000 military advisers to Iraq as well as elite units, and has conducted airstrikes and spent more than $1 billion on military aid.

“The areas that have been liberated from Daesh have been thanks to Iran’s advice, command, leaders and support,” the cleric said.

At the same time, Iraq’s government is increasingly reliant on the powerful militias and a massive Shiite volunteer force, which together may now equal the size of Iraq’s security forces.

Although the Obama administration says it is not coordinating directly with Iran, the two nations’ arms-length alliance against the Daesh is an uncomfortable reality. That’s not only because some of the militia shock troops who have proved effective in fighting the Daesh battled US forces during the 2003-2011 war there, but also because in Syria, Iran continues to support President Bashar Al Assad, whom the US would like to see toppled. US diplomats meanwhile are pushing ahead with negotiations to reach a deal on Iran’s nuclear program to prevent the country from developing a nuclear weapon.

Ali Khedery, who advised several US ambassadors in Iraq, said the tensions that fueled a US-Iran confrontation in Iraq after 2003 are currently masked by the shared desire to defeat the Daesh.

“ISIS (Daesh) will be defeated,” said Khedery, who runs a strategic consulting firm in Dubai. “The problem is that afterwards, there will still be a dozen militias, hardened by decades of battle experience, funded by Iraqi oil, and commanded or at least strongly influenced by [Iran’s Revolutionary Guard Corps]. And they will be the last ones standing.”

While the departure of US troops in 2011 provided space for Iran to expand its influence in Iraq, Tehran’s support for paramilitary groups has intensified since the appearance of Daesh that Iran’s Shiite leaders see as a serious threat to their interests. Combat troops from the Quds Force, a unit of the Revolutionary Guard Corps, now travel to Iraq “from time to time for specific operations with coordination with the Kurdish and Iraqi governments,” the cleric said.

Qassem Sulaimani, the Quds Force commander, has become the face of Iran’s operations in Iraq, with photos of the commander on the front lines circulating on social media.

“He’s our friend, and we are very proud of his friendship,” said Hadi Al Amiri, who heads the Badr Brigade, a Shiite militia. “Anyone now who comes and helps us fight Daesh, we welcome them. We cannot liberate the country by the Iraqi forces alone.”

James Jeffrey, a former US ambassador to Iraq, said the Obama administration may have made a mistake by not conducting limited airstrikes after the Daesh’s initial advance.

Iraqi officials pleaded for assistance this summer as the militants appeared poised to overrun the Iraqi Kurdish city of Arbil and even Baghdad, the capital. But White House officials, frustrated by what they saw as the sectarian policies of then-Prime Minister Nouri Al Maliki, insisted first on political reforms.

“The Iraqis were in desperate straits, and the only ones who came to their rescue was Iran,” Jeffrey said. “These guys will remember that.”

During that time, Iraqi Kurds, the United States’ most constant ally in Iraq, accepted weapons from Iran. “If it was Iran that was coming to (our) aid or the United States, we needed to prevent Arbil from falling into the hands of ISIS (Daesh),” said a Kurdish official, who, like other officials, spoke on the condition of anonymity to discuss security matters.

The collapse of much of Iraq’s army in June also provided momentum and popular support for the increasingly public operations of Iranian-backed militias such as the Badr Brigade, Kataib Hezbollah, Asaib Ahl Al Haq, and a growing number of smaller splinter groups.

Shaikh Jassem Al Saidi, a commander with Kataib Hezbollah, said his group has more than tripled in size since June, now boasting more than 30,000 combatants.

“Iran never left Iraq,” he said in an interview in a house next door to his Baghdad mosque, which has turned into a military base for militia fighters, packed with crates of weapons. “This very close relationship has made Iran support Iraq all they can.”

Al Saidi flicked through pictures on his phone showing him visiting Iran’s Supreme Leader Ayatollah Ali Khamenei during a recent visit to Iran.

Kataib Hezbollah, designated a terrorist organization by the United States, has received new supplies of Ashtar and Karrar rockets from Iran in recent months, he said. The Karrar has been used by the group only once, Saidi said, against an American base in 2011. “It was like a thunderbolt falling from the sky on them,” he said.

American unease about the militia resurgence intensified when US officials detected a lot of chatter via intelligence and diplomatic channels after President Barack Obama’s Sept. 10 speech, in which he outlined his administration’s expanded strategy for countering the Daesh, including airstrikes and a growing US force in Iraq.

“There was a lot of commotion . . . a lot of Shiite militant mobilization in a way that made us very nervous,” a senior US official said. US diplomats worked for weeks to allay Iranian concerns about a US return to Iraq, reaching out to Iraqi Shiite officials in order to telegraph a message to Tehran: Renewed US military involvement in Iraq would be much more limited than it was last time.

“That message we do know resonated and got through to people all over, in Iran and elsewhere,” the official said.

As Obama deploys a force of up to 3,000 to retrain Iraqi troops, there have been no signs of hostility between US forces and Iranian advisers or Shiite militiamen. Unlike the past, US troops will be confined to bases or headquarters and will not have direct combat roles.

Yet the possibility for confrontation is “something we’re constantly worried about . . . as we flow more personnel in there,” a senior US defense official said.

Reports of abuses by Shiite militiamen have increased in recent months, raising fears that militia death squads that helped fuel past sectarian violence are on the march.

Another US official said the militias’ combat power has come “at a steep price.”

“Various Shia militants have pursued scorched-earth tactics leading to the displacement of thousands of Sunni civilians,” the official said.

American officials are also watching to see whether Iraqi Prime Minister Haider Al Abadi has the political clout to hold his unity government together and keep paramilitary forces in check.

Obama’s top advisers are betting that the United States can help contain militia power in the long term by rebuilding a smaller, stronger Iraqi army and backing a new national guard that might incorporate Sunni and Shiite paramilitary fighters.

“This is the single best opportunity we have to counter the Shiite militant efforts and mitigate the influence that Iran will have,” the senior US official said.