What Are the Latest Sanctions?
On August 24, 2026, the U.S. Treasury announced a sweeping expansion of sanctions dubbed “Operation Economic Outcast,” designed to sever Iran's remaining links to the global economy. The new measures target five key sectors: cryptocurrency, weapons technology,
gold reserves, airlines, and shipping. Additionally, sanctions were placed on 60 individuals, entities, and vessels accused of enabling Iran's nuclear program, cyber operations, or oil sales. The stated goal, according to Treasury Secretary Scott Bessent, is to achieve the “economic asphyxiation” of the Iranian regime and force an endgame to the conflict that has unfolded over the last six months.
The Dollar's Global Dominance
To understand how these sanctions work, you first need to appreciate the dollar's central role in the world. The US dollar is the world's primary reserve currency, meaning most central banks hold their reserves in dollars. Crucially, the vast majority of international trade, especially for key commodities like oil, is priced and settled in dollars. This creates a near-constant global demand for the currency. It also means that most significant international transactions, even those not directly involving the United States, must pass through the U.S. financial system for clearing, giving Washington extraordinary leverage.
Weaponizing the Financial System
US sanctions weaponize this dominance by controlling access to the dollar-based system. When the U.S. imposes sanctions, it can prohibit American banks from processing transactions for a targeted entity. Since most global banks need access to the U.S. financial system to conduct their own business, they are forced to comply. Choosing to do business with a sanctioned Iranian entity could mean losing access to dollar clearing services, a risk few international banks are willing to take. As Treasury Secretary Bessent warned, any entity facilitating transactions for Iran “will be removed from the U.S. dollar system.”
The SWIFT Knockout Punch
A key component of this financial isolation is cutting off access to the Society for Worldwide Interbank Financial Telecommunication (SWIFT). SWIFT is a messaging network used by thousands of financial institutions in over 200 countries to securely send and receive information, such as money transfer instructions. It doesn't move money itself, but it is the primary way banks communicate for international transactions. Under pressure from the U.S. and its allies, SWIFT has previously disconnected Iranian banks from its network. This action makes it incredibly difficult and costly for Iran to get paid for exports or pay for imports, effectively crippling its ability to engage in normal international trade.
Secondary Sanctions: The Global Ripple Effect
Perhaps the most powerful and controversial tool is “secondary sanctions.” These measures target non-U.S. individuals, companies, and even countries for doing business with a sanctioned entity. For example, a company in India, China, or the European Union could face massive fines or be cut off from the U.S. market for trading with Iran, even if that trade is legal in their own country. The latest sanctions put the world on notice, threatening to penalize Iran's trading partners if they do not sever ties. This forces foreign governments and businesses into a difficult choice: continue trading with Iran and risk U.S. penalties, or abandon the Iranian market to preserve access to the much larger U.S. economy.
Impact on Iran and the World
The economic impact on Iran is severe, contributing to currency collapse, soaring inflation, and difficulty importing essential goods. The threat of secondary sanctions also creates significant diplomatic friction. Nations like China and India, which are major trading partners with Iran, have often been put in a difficult position, caught between their economic interests and the fear of U.S. reprisals. While Washington hopes this economic pressure will change Tehran's behavior, it also fuels a global debate about over-reliance on the U.S. dollar, with countries like Russia, China, and Iran increasingly looking for ways to conduct trade in other currencies to bypass American control.
