Since assuming office in 2009, President Barack Obama has consistently held that the United States would carry out airstrikes to prevent Iran from acquiring a nuclear weapon. This position is supported by the vast majority of U.S. policy makers, lawmakers and the political elite, regardless of political affiliation.
Nonetheless, it is also generally agreed that airstrikes against Iran’s nuclear facilities would only have a limited impact on preventing Iran from acquiring the bomb. To be sure, a concerted airstrike effort against Iran would delay its ability to build a nuclear arsenal by several years. Nonetheless, Iran would be able to rebuild its nuclear facilities before long, especially given the windfall in economic relief it would undoubtedly receive once the sanctions regime against it unraveled in response to America’s military action.
The only military action that can truly prevent Iran from acquiring a nuclear weapon, then, is for the United States to invade and occupy the country, potentially turning it over to a U.S.-friendly regime that would uphold Iran’s non-nuclear status. Despite the widespread support in the United States for preventing Iran from building a nuclear weapon, this option is almost never proposed by any serious observer.
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Part of this undoubtedly reflects America’s fatigue following the wars in Iraq and Afghanistan. However, it goes much deeper than that—namely, while Iran’s military is greatly inferior to the U.S. armed forces, the U.S. military would not be able to conquer Iran swiftly and cheaply like it did in Iraq and Afghanistan. In fact, Tehran would be able to impose prohibitive costs against the U.S. military, even before the difficult occupation began.
Iran’s ability to defend itself against a U.S. invasion begins with its formidable geography. As Stratfor, a private intelligence firm, has explained, “Iran is a fortress. Surrounded on three sides by mountains and on the fourth by the ocean, with a wasteland at its center, Iran is extremely difficult to conquer.”
While the “stopping power of water” has always made land invasions far more preferable for the invading party, the age of precision-guided munitions has made amphibious invasions particularly challenging. As such, the United States would strongly prefer to invade Iran through one of its land borders, just as it did when it invading Iraq in 2003.
Unfortunately, there are few options in this regard. On first glance, commencing an invasion from western Afghanistan would seem the most plausible route, given that the U.S. military already has troops stationed in that country. Alas, that would not be much of an option at all.
To begin with, from a logistical standpoint, building up a large invasion force in western Afghanistan would be a nightmare, especially now that America’s relationship with Russia has deteriorated so greatly.
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More importantly, however, is the geography of the border region. First, there are some fairly small mountain ranges along the border region. More formidable, going from the Afghan border to most of Iran’s major cities would require traversing two large desert regions: Dasht-e Lut and Dasht-e Kavir.
Dasht-e Kavir is particularly fearsome, as its kavirs are similar to quicksand. As Stratfor notes, “The Dasht-e Kavir consists of a layer of salt covering thick mud, and it is easy to break through the salt layer and drown in the mud. It is one of the most miserable places on earth.” This would severely constrain America’s ability to use any mechanized and possibly motorized infantry in mounting the invasion.
Iran’s western borders are not any more inviting. While northwestern Iran borders Turkey, a NATO ally of the United States, Ankara refused the United States permission to use its territory for the invasion of Iraq. Regardless, the Zagros Mountains that define Iran’s borders with Turkey, and most of Iraq, would make a large invasion through this route extremely difficult.
The one exception on Iran’s western borders is in the very south, where the Tigris and Euphrates rivers collide to form the Shatt al-Arab waterway. This was the invasion route Saddam Hussein used in the 1980s. Unfortunately, as Saddam discovered, this territory is swampy and easy to defend. Furthermore, not long after crossing into Iranian territory, any invading force would run into the Zagros Mountains. Still, this area has long been a vulnerability of Iran’s, which is one of the reasons why Tehran has put so much effort into dominating Shia Iraq and the Iraqi government. Unfortunately for any U.S. president looking to invade Iran, Tehran has largely succeeded in this effort, closing it off as a potential base from which America could attack Iran.
Thus, the United States would have to invade Iran from its southern coastline, which stretches roughly 800 miles and is divided between waterfront adjoining the Persian Gulf and Gulf of Oman. Iran has been preparing for just such a contingency for the better part of a quarter of a century. Specifically, it has focused on acquiring the capabilities to execute an antiaccess/area denial strategy against the United States, utilizing a vast number of precision-guided and nonsmart missiles, swarm boats, drones, submarines and mines.