Treasury Launches 'Operation Economic Outcast' on Iran as Trump Threatens 50% Canada Auto Tariffs and Chip Stocks Slide Before Nvidia

Secondary Sanctions

Secondary sanctions are penalties a government imposes not on the target of its sanctions, but on third parties — banks, companies, even other countries — that keep doing business with the sanctioned target anyway. Ordinary 'primary' sanctions only bind the sanctioning country's own citizens and companies: they simply aren't allowed to trade with, say, Iran. Secondary sanctions extend the reach much further by threatening any foreign bank or firm, wherever it's based, with being cut off from the U.S. financial system and dollar-clearing if it keeps transacting with the sanctioned party. That threat carries enormous weight because the dollar underpins the vast majority of global trade and finance. Most cross-border transactions — even ones with no American company involved at all — still clear through U.S. correspondent banks at some point, since the dollar is the world's dominant reserve and settlement currency. Losing that access effectively locks a bank out of large parts of the global economy, not just its dealings with the sanctioned country. That's what makes secondary sanctions so much more powerful than primary sanctions alone: they turn the sanctioning country's control over dollar infrastructure into leverage over the entire global financial system, not just its own borders. The tool has real limits, though. Broader secondary sanctions squeeze the target harder, but they also risk alienating allies and trading partners who get caught in the crossfire, and they push targeted countries to build parallel, non-dollar payment systems to route around the pressure — a slow erosion of the very leverage the sanctions rely on. Iran and Russia have both invested in alternative payment networks for exactly this reason.