Know This: A U.S.-Iran War Would Not Be Fought Only in Iran

July 2, 2019 Topic: Security Region: Middle East Blog Brand: Lebanon Watch Tags: IranWarOmanSyriaForeign Policy

Know This: A U.S.-Iran War Would Not Be Fought Only in Iran

Conflict with Iran would not only be fought on Iranian soil, but could extend into Iraq, Syria, Lebanon, Israel, Saudi Arabia, Yemen, the Persian Gulf, and Gulf of Oman—engulfing the region in war.


Residents in northern Cyprus were surprised on July 1 when a S-200 missile slammed into the side of a mountain in the wake of an Israeli airstrike in northern Syria. Israel has targeted Iranian bases and weapons transfers to Hezbollah more than a thousand times in the last seven years. Iran has threatened to respond, but Tehran now faces larger concerns as it wrestles with Washington and seeks to raise tensions in both the Gulf, Iraq and Yemen among its allies and proxies.

An arc of simmering conflict runs from the waters off Cyprus to the Gulf of Oman where the U.S. Global Hawk was downed in June, to Abha in Saudi Arabia which has been targeted by Iranian-backed Houthi drones. It is a frontline that stretches three thousand miles and marks out the potential flashpoints between the United States and its allies against Iran and its allies and proxies. Viewing the region through this complex map of interlinked conflicts is the best way to see the current U.S.-Iran tensions in the context in which they have grown. It also reveals the possible ways Iran and its proxies might strike at the United States and its allies. In some cases these conflicts have already broken out.


Tensions between the United States and Iran grew in early May after National Security Advisor John Bolton warned of Iranian threats and Secretary of State Mike Pompeo flew to Iraq to discuss those threats. This is the latest phase of a complex challenge that Iran poses to U.S. and Western policymakers, as well as local allies. After the Trump administration left the Joint Comprehensive Plan of Action, or Iran deal, in 2018, Iran has been subjected to new sanctions. Tehran has warned that if European powers cannot find a way to meet its demands for a way around these strictures it will break through agreements about the amount of enriched uranium it stockpiles. This has now occurred and further threats have been issued.

The larger picture is that Iran has been nurturing its role in its near abroad, particularly Iraq and Syria, and providing support to Hezbollah in Lebanon and the Houthi rebels in Yemen. Much of this support is well known. For Hezbollah it means not only financial packages but also precision guidance for a rocket arsenal that now numbers up to 150,000. Hezbollah has said all of Israel is within its range. In the waning days of 2018, Israel launched an operation along its northern border to ferret out Hezbollah tunnels. This was a warning to Beirut that Israel knows what Hezbollah is up to.

Iran has indicated that a conflict with the United States would result in attacks on Israel. Mojtaba Zolnour, chairman of the Iranian parliament’s National Security and Foreign Policy Commission said Israel would be destroyed in the event of war with the United States, according to a report on July 1.

That could mean a Hezbollah-Israel war, but it could also mean opening up a front in Gaza and in Syria. For instance, Iran has supported Hamas, which has run Gaza since 2006, and Islamic Jihad, a militant Palestinian group that has fired rockets at Israel from Gaza over the last year. Using its Iron Dome air defense system, Israel has deflected most of the more than 1,000 rockets fired since March 2018, thus foregoing the need for a large ground offensive like the ones that took place in 2009 and 2014.

Iran has also established bases and infrastructure in Syria. This includes Islamic Revolutionary Guard Corps (IRGC) bases that have been used to support the Syrian regime of Bashar al-Assad in the conflict against the Syrian rebels since 2011. There are also Iranian-backed militias from Iraq who have gone to Syria to serve in the conflict. The existence of this Iranian infrastructure has generally been revealed through tensions with Israel. More than one thousand airstrikes by Israel against targets from Damascus to two hundred kilometers north in Latakia and Homs provinces, reveal the extent of Iran’s role and Israel’s desire to reduce or at least stall the growth of Iranian entrenchment. In addition, several serious incidents illustrate that Iran’s goal in Syria has grown from helping the regime defeat the rebels to using Syria for other purposes. This has been seen as part of Iran’s attempt to carve out a “road to the sea” or corridor of influence via Syria to Lebanon. In February 2018, an Iranian drone flown from Syria entered Israeli airspace near Beit Shean. It was shot down and Israel struck the T-4 airbase on the road to Palmyra where the drone was allegedly flown from. Later in May, a salvo fired from Syria resulted in another round of Israeli retaliations.

The simmering conflict puts Syrian air defense in an awkward position. If they don’t defend their Iranian ally that will be seen as giving Israel a carte blanche to do as it wants. But Syrian air defense has also proved remarkably erratic. In September 2018, an S-200 fired at an Israeli warplane struck a Russian plane that was landing in Latakia. Angered, Russia said it would supply Syria with the S-300 air defense system. That system remained dormant until June 30 when a satellite image from ImageSat International showed it deployed near Masyaf. It wasn’t clear if it was operational and when Israeli struck targets nearby the next day the system did not appear to be used. Instead another S-200 fired wildly went out to sea and hit a mountain in northern Cyprus. In another instance in 2017, a Syrian missile flew over Jordan and had to be intercepted by Israel’s Arrow 3 defense system. Syria’s one success was a missile that targeted an F-16, leading to the plane crashing in northern Israel.

Israel’s frontline in a potential growing crisis with Iran is clear. It could involve Gaza, southern Lebanon and targets in Syria. In the past Israel has warned that Hezbollah’s role in Lebanon, where it controls the Health Ministry and has a powerful political and military presence in the country, has ramifications for Lebanon in general. This will be a more serious conflict than the one in 2006, which was a precursor of worse to come. Hezbollah’s weapons have increased in precision and it has thousands of battle hardened men who fought in the Syrian Civil War. Israel’s air defense and arsenal has also increased.

For the United States, the arc of confrontation with Iran stretches down the Euphrates river in Syria where U.S. forces and their partners in the Syrian Democratic Forces defeated the Islamic State in March of this year. In addition, the United States continues to play a role in Tanf, a barebones desert base established in Syria near the border of Iraq and Jordan. The base was supposed to train anti-ISIS fighters, but its long-term fate is unclear. When President Donald Trump announced the United States would leave Syria in December 2018, it appeared to be on the menu to be folded up, but it is still there. The United States has warned Iranian-backed militias and Syrian regime forces to keep out of an exclusion zone around the base, which they have harassed in the past with bloody results.

Along the Euphrates River, tensions flared in February 2018 when a group of pro-Syrian regime militias attacked the U.S.-backed Syrian Democratic Forces (SDF) and the United States responded, allegedly killing Russian mercenaries among the Syrians. Later, in the summer of 2018, an airstrike on a Kata’ib Hezbollah base led to accusations by the group that the United States was behind the attack—although it may have been Israel. Kata’ib Hezbollah, which the United States considers a foreign terrorist organization (FTO), is closely linked to Iran’s IRGC, which Washington also designated as an FTO this year. The summer 2018 airstrike illustrates that in Syria the multiplicity of Iranian-linked groups would mean that any outbreak of hostilities could also result in conflict along the Euphrates between the United States and partners, such as the SDF, and groups like Kata’ib Hezbollah. Iran also proved with ballistic missile strikes in the fall of 2018 that it can target this area, so nothing is off the table. Although Iran said it was retaliating for an ISIS attack in Ahwaz, the United States asserted that it had not been warned beforehand.

Tensions with Iran also threaten U.S. forces in Iraq. For instance, in the spring of 2018, a quarterly Department of Defense report in May noted “Iranian support for certain PMF [Popular Mobilization Forces] militias posed the greatest threat to the safety of US personnel in Iraq.” A more recent Inspector General report on the U.S. anti-ISIS campaign warned about the need to divert resources from the anti-ISIS fight to monitor Iranian threats in Iraq.

Trump said in December 2018 that the United States could use Iraq to “watch” Iran, leading Iraqi officials to respond that the country should not become an area of conflict. However, on May 14, U.S. officials say a drone was launched from Iraq targeting a pipeline in Saudi Arabia. Five days later, a rocket landed near the U.S. embassy in Baghdad, and the Washington has blamed Iranian-backed forces for the attack. In mid-July four days of rocket attacks followed, near U.S. forces in Camp Taji and Mosul, and against Balad Air base and oil facilities near Basra.