A U.S. air raid against Iranian-backed fighters in    southern Syria last week represents a volatile new phase of the    conflict that could trigger a wider confrontation between the    United States and Iran  and their allies on the ground.  
    Until last weeks strike, the United States and Iran had    managed to steer clear of a direct confrontation in Iraq and    Syria, where each has hundreds of military advisors on the    ground, embedded with local forces. In Iraq, they share a    common enemy in the Islamic State. In Syria, the two sides are    waging different wars: U.S. aircraft and special operations    forces are pushing to roll back Islamic State militants, while    Iran is backing the Syrian regime against opposition forces in    a multi-sided civil war.  
    But as the Islamic States grip on territory weakens, the    United States and Iran are increasingly at odds as their local    partners vie for control of key terrain along the Syria-Iraq    border.  
    In the May 18 air strike, U.S. F-16s hit a convoy of    Iranian-armed Shiite fighters who failed to heed warnings to    stay away from a base at al Tanf, close to the Jordanian and    Iraqi borders, which is used by American and British special    forces to train local militias fighting the Islamic State. The    air strike marked the first time U.S. forces had targeted    Irans proxies in Syria. A few days later, the Iranian proxies    returned to the area, and U.S. warplanes buzzed them in a clear    warning to keep away, the Pentagon said Tuesday.  
    U.S. military officers played down the incidents, saying    the airstrike was merely a matter of safeguarding American    special operations forces in the countrys southeast.  
    This doesnt signal any change in strategy, said a    senior U.S. military officer, who spoke on condition of    anonymity.  
    The U.S. strategy, under both President Donald Trump and    former President Barack Obama, has concentrated on defeating    Islamic State forces on the battlefield and depriving them of    territory in Iraq and Syria. With the exception of missile    strikes against Syria last month in retaliation for its use of    chemical weapons, the Trump administration so far has chosen    not to enter into a military confrontation with the Syrian    regime of Bashar al-Assad, or its patrons  Iran and    Russia  
    Having pushed Islamic State back in much of northeastern    Syria, U.S. commanders are determined to oust the militants    from their last urban bastion in Raqqa. A U.S.-armed and    trained force of Kurdish and Arab fighters has begun to    encircle Raqqa, and once the city falls, American officers hope    to hunt down ISIS in eastern Deir Ezzor province and the    Euphrates River Valley, where the group still exists in    force.  
    But Iran has grown alarmed over the growing presence of    U.S. special operations forces in southern Syria, and the    progress of Syrian Kurdish and Arab troops on the battlefield.    Iran is keen to secure a corridor linking Tehran and Baghdad to    Syria and Lebanon, and Tehran state-run media have claimed the    U.S. forces are in the border area to block any supply routes    for Iran.  
    In response, Tehran has deployed thousands of Afghan and    Iraqi Shiite fighters, and in recent weeks has sent 3,000    Lebanese Hezbollah troops to the southeastern region between al    Tanf and Deir Ezzor, according to    reports from Fars news agency, affiliated with Irans    Revolutionary Guard Corps.  
    The Hezbollah troops were sent to the al-Tanf area to    prepare the Syrian army and its allies for thwarting the U.S.    plots in the region and establish security at the    Palmyra-Baghdad road, Fars wrote, just hours before the U.S.    air raid. They could also serve as a blocking force to keep    U.S.-backed fighters from moving north out of al Tanf.  
    The escalating tensions between Washington and Tehran in    Syria coincided with tougher rhetoric from President Trump    directed at Iran. In a speech this week in Saudi Arabia, Trump    labeled Iran as a source of destruction and chaos, and called    on countries in the region to form a united front against    Tehran.  
    Although Trump has promised to adopt an aggressive stance    with Tehran, the White House is still conducting a review of    its policy toward Iran and the administration has yet to    articulate U.S. goals along the Syria-Iraq border.  
    Its not clear to me yet if the administration has a    detailed strategy [on] how to manage its presence and its    allies presence in eastern Syria, said Robert Ford, former    U.S. ambassador to Syria and now a fellow at the Middle East    Institute.  
    If the administration is not careful, its going to be a    slippery slope. It seems like theres a potential for more    conflict.  
    The Trump administration has given the U.S. military the    authority to base about 1,000 troops  mostly special    operations forces  in Syria, spread out among several small    outposts in the Kurdish north, a Marine Corps fire base close    to Raqqa, and at al Tanf in the south. These small outposts are    separated by hundreds of miles of territory where ISIS is    steadily losing control, and which regime forces and their    Iranian allies see as fertile ground to reestablish the Syrian    governments control.  
    The U.S.-led coalition is keeping a wary eye on the    militias. One U.S. defense official told    FP they are watching the militias inch    their way eastward toward Deir Ezzor, where the Syrian    government maintains a significant  and isolated  military    outpost. The base has long been cut off from other areas of    regime control and can only be resupplied by airdrops, but it    was recently reinforced by about 1,000 Syrian soldiers, giving    the regime in Damascus some fighting power in the area.  
    American military leaders have long said they expect ISIS    to retreat into the Euphrates River Valley that connects Raqqa    to the Iraqi border, and U.S. and coalition aircraft have been    striking ISIS targets in the valley for months. U.S. warplanes    carried out more air strikes in the area this week.  
    Some of the Iranian-backed militia fighters remain in    place near al Tanf, despite the U.S. air strike and last    weekends warning. If they resume their advance,    coalition forces will defend themselves, Pentagon spokesman    Capt. Jeff Davis told reporters on Tuesday.  
    Another military official added that we have a good    understanding they will want to continue moving east toward    Deir Ezzor, and the fighters are being closely tracked.  
    When the fight moves to the Euphrates valley in Deir    Ezzor, the risks of an unintended conflict will grow. With    U.S-backed Free Syrian Army forces moving from the south,    Kurdish and Arab Syrian Democratic Forces advancing from the    north and west, pro-regime militias trying to push into the    area and both American and Russian aircraft buzzing overhead,    some worry that the crowded battlefield could lead to unwanted    incidents.  
    The Iranian supported militias often operate in close    proximity to U.S. troops, especially in Iraq. An    FP reporter,     visiting a U.S. military base south of    Mosul earlier this year, saw a chart in the operations center    with the flags of the major armed Shiite militias operating in    the vicinity, so U.S. forces could identify what groups are    operating close by, often just on the perimeter of their    base.  
    Last September, U.S and coalition jets    inadvertently struck a small outpost in the east of Syria,    killing over 60 Assad regime soldiers in an incident that    angered Moscow and highlighted how confused the battlefield    there can be.  
    With American troops on the ground, and advisors moving    around with small local units, there remains the danger of    Iranian retaliation. During the U.S. occupation of Iraq, Tehran    provided Shiite militias with deadly roadside bombs and rockets    that claimed hundreds of American lives.  
    Already, Iranian-backed Iraqi militia groups        have increased their anti-U.S.    propaganda in Iraq, accusing Washington of aiding the Islamic    State and pressuring the Baghdad government to expel American    troops advising the Iraqi security forces inMosul and across    the country, Ahmad Majidyar, director of    the IranObserved Project at the    Middle East Institute, wrote recently.  
    Any response from Iran would be asymmetrical, Majidyar    said, and could come in places like Iraq.  
    Photo Credit: JOSEPH EID/AFP/Getty    Images  
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Are the US and Iran on a Collision Course in Syria? - Foreign Policy (blog)